What's the (current) process for getting Arrow locks fitted by USPS?
Happened to spot our regular USPS carrier delivering today's mail, and flagged him down to pepper him with the same questions I posted here.
The USPS will install Arrow locks, on request, free of charge. In fact, there doesn't even necessarily have to be an actual request — not an explicit one, anyway. He says that if/when he notices a building on his route has installed a key keeper with no lock, he'll let his manager know, and they'll show up to secure it. (We can, of course, also call and explicitly make that request.)
And since — in our particular situation — he already has the key to put inside the box once it's secured, installing the box itself is literally the only thing we need to do.