Even if the postman scans each person's mail and each piece of mail as he delivers it, he can still drop the item on the ground after he does that. I've certainly had to retrieve my mail from the street, other people's mailboxes, etc.
"Even if the postman scans each person's mail and each piece of mail as he delivers it, he can still drop the item on the ground after he does that. I've certainly had to retrieve my mail from the street, other people's mailboxes, etc."
Not only can he drop it, the mailman can be delivering the mail to the wrong mailbox in the first place. I've had that happen countless times. I used to live in a house and would commonly get the mail for another house on the corner. And in an apartment situation with a bank of mailboxes mail is commonly shoved into the wrong box. Even if the mailman was scanning mail one femtosecond before he puts it in the box it does not matter if he THINKS he's at the right box but is WRONG. And we know the regular post office does not scan anything before leaving it. They barely glimpse at it with their eyeballs.