Earlier quoted context omitted.
> Like when I cleverly managed to mail my apartment keys to myself, including my only mailbox key... If my mailbox key was locked inside my mailbox, I would just wait for the postal person to show up. They have keys that open the entire wall of mailboxes. Just wait in the distance until they open the wall and then go get the mail out of your box. Just act like you don't see anything wrong with grabbing your mail and…
This is bad practice from the mailman. The lock is there so that only the owner of the box can authenticate and retrieve the mail. If he allows people to walk up and select mail from the box then he is allowing a circumvention of the authentication protocol.
It may be worth reiterating that I (or anyone) can open my (or anyone's) mailbox with a pair of bobby pins. This "authentication protocol" may not be worth making too much hay over.