Bommer 670-07

Q: Hi AB Supply Technical Person - We have bought a few of Bommer 670-07 locks from you in the past couple of years to replace the locks in 2x4 tenant mailboxes in our residential building that are 20 years old. The replacement locks were bought because tenants lost their keys. What’s happened in the past few months is a little disturbing because we don’t know how it’s happening. Thieves get into our lobby and somehow manage to open all 8 vertical mailboxes and leave them open but all in a 'locked' position. They do not open them using the post office master key. (We have subsequently secured our front gate to prevent entry into the lobby). I’m asking you if you have any idea how this could be happening? Is there a special tool or key that the thieves might have? USPS has no idea, but I suspect that the mailboxes are left open and in a locked position because they need to remove whatever tool they are using. I’ve attached a picture for clarification as seen here:

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Please note the mailbox locks all being in a locked position. Thank you for any information,