Wow. I think if we had that problem here Id drop everything off at the post office. We live in the middle of nowhere so following the Postman would be a waste of time. Only mail problem we have here is the snow plows. One second you have a mailbox...the next you dont. Ive lost so many mailboxes to plows and drunk drivers that I stopped burying the post. Its sitting in 2 Tidy Cat containers filled with cement.In this area, someone has a key to all the blue Post Office mail boxes. The local 'Neighborhood' website is full of people whose checks have been stolen, the ink chemically "washed' off and re-written to someone else.
If they didn't have the key I'm sure they could just follow the Postman and loot the mailboxes. The delivery is so bad, It probably wouldn't be noticed. Sorry.