In general, our letter carriers have been pretty good, except when our area was designated a "training route" for a couple years. It was a PITA, but probably good for the neighborhood, as we all met in the street around 6pm every night to exchange mail that had been delivered incorrectly each day.
We have 4 community boxes in the neighborhood, and one (ours) was broken into 4 times. (it's a little less observable than the others) They were light sheet metal with doors in the rear, so easy to hide while breaking in. We complained, and the PO said that they were all going to be replaced soon with new armored boxes. Yay!
The other 3 boxes were quickly replaced, but not ours. After a couple months, I was able to track down the woman in charge of this program, and set up a meeting. I asked why ours was not replaced, and she said they had used all the money budgeted for the program, and that it would be at least a year before they got more money.
I asked her to explain why she replaced the 3 boxes that had not been broken into, and not replaced the one box that had been broken into 4 times. She had no answer. I kept pressing, & she told me to get out of her office or she would call the cops.
I contacted a local investigative TV reporter, and after he called her, we had a new box that same week.
It has not been broken into since.
If she is representative of their management, I can see why they are losing billions.