Comment by imtringued

I have a mailbox in a multi family home. The keys are numbered and standardized. There are identical mailboxes out there that have the same key as me. In fact, I had to buy a replacement key since the original key broke and I just had to tell the manufacturer which number my mailbox had.

My neighbor could in theory buy the key to my mailbox, but it would be illegal for him to actually open my mailbox and read my mail.