Let's say you had a po box. Anyone with a box within maybe 5 feet of yours can, in fact, be accessed from your box ~ open the door, reach in with your handy dandy box emptier, and you can use a mirror on a stick, and your emptier to go through all the mail and find what pleases your eye.
Envelopes with money kind of stand out.
This is a common method for stealing.
I didn’t have a P.O. box. We lived in a house on a street where there were only two other houses, and my neighbors wouldn’t have done that. It was a postal employee.
Now if you are referring to the incident involving dwcusmc (instead of the incident that I described), which I believe you are, that’s a cop-out. Chances are that it was in fact a postal worker who stole his money. You just don’t want to ADMIT it.