Comment by b112

Obviously you're summarizing a frustrating problem, so my suggestion may be unhelpful. However, mail tampering is a serious crime. If everyone is complaining, and the USPS is doing nothing, it should be handled as a crime.

I'm not familiar with US law in this, but I know the FBI has stepped in for some cases that are over state borders. Anecdotally, that is.

And I also know that private citizens can bring criminal cases to the prosecutor if the police aren't. If there are a lot of you, it wouldn't be too expensive to jointly hire a lawyer. Because this is absolutely not normal, at all.

And it should be squashed, and hard, with people led away in cuffs.

If this problem is persistent, the local city should get involved too.