Regarding the removal of post boxes, I just want to say that the reason they are probably being removed is because thieves use those long handled grabbers to reach in them and pull out the mail.
Then they find ones with check and cash and cash cards and throw the other mail away.
My neighbor had it happened to him.
Almost had his water turned off because the Water company didn't get his check.
He found that somebody had cashed it.
tip: DON'T EVER USE THE POST BOXES….take your mail inside the post office