Not to change the subject of your thread too much but I had pointed out in the past that illegals have been known (at least in west Texas) to use a mailbox of an abandoned house to receive SS and government benefits. A long vacate rent house can also become a target.
I raise the flag on my mailbox here on the farm but I only place mail in the box within hours of the postman's arrival. On a busy day, we get about three cars along our road. However, if it's a big payment, as in the monster check I just mailed to the Bailey County, Texas Tax Appraisal office on Friday, I take those to the Post Office's inside drop box. The loss of one of those checks could bankrupt Donald Trump.