The USPS is supposed to be the only one that can open the master lock on multi-drawer mailboxes, aka cluster box units or CBUs, but thieves are regularly cleaning out entire CBUs across the region, quickly and silently. Many communities have had their mail stolen several times in a single year! The problem is a widespread epidemic, with no solution in sight… until now.
Yes, I need Mailbox Protector →
Criminals are robbing mail carriers at gunpoint specifically to get their Arrow keys. What used to be street crime is now an organized operation: steal master keys, open dozens of CBUs, grab all the mail, find the checks, wash them with household chemicals, change the payee and the amount, then deposit large sums into mule accounts. The thieves are also after credit cards, social security numbers, account numbers, and gift cards.
This is all possible because a single Arrow key unlocks every mailbox cluster in a zip code. When one key is stolen, mail for hundreds – even thousands – of people is instantly vulnerable. Thieves know this and they are taking full advantage of this inherent system weakness. Need proof? Just check out these eye-opening videos:
“In early December, mail carriers were robbed of their master keys at gunpoint and in the weeks since, mail theft has grown to unprecedented levels. The thieves are brazen – many mailbox break-ins are occurring during broad daylight, minutes after mail is delivered.”
– Denver public service announcement sent to over 1,200 CBU residents (2026)“A thief with a master key broke into our CBU. A USPS supervisor informed me that it would be impossible to re-key our mailbox cluster because all CBUs in our zip code have the same master key, and all of them would need to be re-keyed.”
– Seattle resident, after a second CBU break-in within 7 months (2025)Here are some numbers that shed light on the scope of the problem:
| Metric | Number |
|---|---|
| Total Arrow locks in the U.S. | 16M+ |
| Locks USPS plans to replace with electronic versions – ever! | 49,000 |
| Arrow keys reported stolen in 2024 – up 27% year over year | 3,400+ |
| Of carrier robberies specifically targeting the Arrow key (source: Postmaster General) | 82% |
| Cost of black-market Arrow key | $5,000+ |
| Stolen Arrow keys ever recovered | Most are never found |
Mailbox Protector is a highly visible combination lockbox – opened with words, not numbers – that attaches to the CBU, covering and protecting the Arrow lock, and creating a second layer of security that thieves can’t penetrate. By preventing unauthorized access to the Arrow lock, it renders stolen keys useless. Once installed, Mailbox Protector instantly hardens a mailbox cluster – and its bright blue color is an instantly visible deterrent that gets thieves to move on to other, softer targets elsewhere.
Organized theft rings prioritize speed and volume. A strong visible security device blocking the CBU’s Arrow lock will make thieves seek easier targets down the road. The result: Mailbox Protector is an effective deterrent.
Mailbox Protector is a heavy duty, all-mechanical lock that is opened via a keypad using word-based combinations. Its strong construction and simple design is built with durability and ease of use in mind. Mailbox Protector is sturdy, uncomplicated, and made to last.
Mailbox Protector does not use batteries, Bluetooth, or Wi-Fi; there is nothing to charge, connect, or hack – no power or other connection is needed for it to work. Mailbox Protector works in and under any condition.
Mailbox Protector is opened by a push-button keypad that won’t jam or rust, thanks to its weather-proof cover and alloy metal construction. It is not a lightweight thumbwheel lock that may be fine for a gym locker, but is not built for years of service on an exposed mailbox cluster. Mailbox Protector is reliable and dependable.
Mailbox Protector features alpha-buttons that enable simple, easy-to-remember word codes rather than difficult-to-remember numeric combinations. The passcode can be programmed in minutes with a screwdriver and can be easily changed if it falls into the wrong hands. Mailbox Protector is easy to use and easy to program.
The best security device is one that thieves see and walk away from. Mailbox Protector’s robust, solid metal housing and bold blue color signals to would-be thieves that this CBU is hardened and not worth the effort. In towns full of unprotected mailbox clusters, standing out is both an advantage and a deterrent. Make your mailbox cluster the one thieves skip.
At a national level, the USPS does not have an answer to the mailbox cluster theft problem. They aren’t replacing millions of vulnerable Arrow locks with advanced, theft-resistant locks anytime soon. At a local level, your local postmaster doesn’t have the tools, technology, budget, or bandwidth to combat it, even though they suffer the consequences every day: upset customers, carrier-safety concerns, and burning resources on an issue that diverts them from their core mission of delivering the mail efficiently.
So, the solution is up to you as a property manager. However, since your local postmaster wants a solution to this problem just as badly as you do, you have a natural ally right in your own zip code.
Mailbox Protector was created in California’s Silicon Valley, where a number of HOAs have received approval from postmasters to participate in Mailbox Protector pilot programs. Numerous mailbox clusters in Mountain View, Sunnyvale, and Santa Clara are now equipped with Mailbox Protectors, with positive results and enthusiastic response from the early adopters. For the first time ever, thieves can’t use their stolen Arrow keys to steal mail at will!
“I am thrilled to see that the Mailbox Protectors have been installed. This is a huge win, and I am glad that after so many discussions and research we were able to make it happen. Thanks for making it into reality!”
– HOA Board Member, Mountain View
Property managers and self-managed HOAs are eligible to apply for inclusion in the ongoing Mailbox Protector Pilot Program in Santa Clara County. Register today for more information.
As a federal agency, the USPS does not generally endorse third-party products, including Mailbox Protector. However, your local postmaster has broad authority in overseeing mail delivery and is on the front-lines of the mail-theft battle. Since the cluster boxes are owned by the HOA, not the USPS, a local solution is finding strong support among postmasters in the Silicon Valley pilot program area. Currently, postmasters in several Santa Clara County cities have authorized Mailbox Protector installations, so it’s possible, even likely, that Mailbox Protector has already been approved for installation in your area. Register today to find out.
Here’s your step-by-step action plan to get protected against mail theft:
Current Pilot Program Pricing below is per property/HOA location in Santa Clara County. Prices include professional installation and setting a USPS-approved combination.
| Quantity | Price Each |
|---|---|
| 1 or 2 | $349 + tax |
| 3 – 5 | $299 + tax |
| 6 – 9 | $269 + tax |
| 10 or more | $249 + tax |
Mailbox Protector carries a lifetime warranty against defects in mechanical performance, such as button failure, latch failure, or device jamming. Should the product fail in the manner described, after providing proof of failure, customer may request a replacement product and re-installation at no charge.
This warranty does not cover units damaged from misuse, or inoperable units due to lost passwords after miscoding. In those cases, replacement units are available to any previously installed units at a rate of 50% off the then-current pricing.
Mailbox Protector is currently deployed at pilot sites throughout Santa Clara County. Join the list of HOAs and property management partners to install a lasting mailbox theft solution.
Sign Me Up →Pre-order for your properties located in San Mateo County and/or Alameda County in order to lock in availability as we expand from the South Bay to the Peninsula and East Bay.
Pre-Register →If you are interested in getting a pilot program going in your area outside one of the Bay Area, we’d love to hear from you and get you registered for updates on our expansion plans for mid-2027.
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Blake is a Silicon Valley property manager and business owner with decades of experience managing HOAs. During that time, his customer base has seen mailbox break-ins escalate from a nuisance to an epidemic.
When Blake went looking for a solution, he ran into a wall of indifference. USPS research committees have been studying the problem for years with nothing to show for it. The cluster box manufacturers told him it wasn’t their problem. The major lock companies told him the market wasn’t worth their time. And local postmasters said, in essence, “If you find a solution, be sure to let us know!”
So Blake contacted his brother-in-law Lou, a former executive at Panasonic and Logitech, with decades of experience bringing consumer hardware products to market. Lou knows what it takes to launch successful products: they must solve a customer problem, and be innovative, easy to use, and built to last.
In true Silicon Valley tradition, Lou’s garage became a makeshift metal shop, where trial and error, scrapped prototypes, and many iterations led to a commercially viable mail theft solution. The result is Mailbox Protector – the only purpose-built mechanical security device for mailbox clusters on the market.
Created in Silicon Valley, piloted in Santa Clara County, and built to go wherever mail theft happens… which, unfortunately, is everywhere.
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Fill out the form below and check all boxes that apply. We’ll follow up based on your selections.
We’ll be in touch within one business day. If you applied for one of the pilot programs, expect a short questionnaire about your community’s specific location, needs and timing.