My U.S. mail lady gets a nice gift every Christmas, because I’ve never had a problem with mail; and before she came on the job, if anything was returned to the post office, I just had to call and have it redelivered. I know a lot of people have problems with the Post Office, and it could be different in different areas, but I’ve never had a problem with the U.S. Mail.
(FedEx is another story...)
You are lucky. My post office contracts deliveries out to a third party agency. Who hires unqualified underpaid and over worked employees who burn out in 6 months. And another takes their place.
Our community has cluster mailboxes at the gate. There’s always someone else’s mail in our mailboxes.
There is a great service from USPS called Informed Delivery. Each morning I get an email of the snail mail that is to be delivered each day. It’s the bestest.
I also have a super nice mail lady, but my former local P.O. was “Surly Incompetence Central”. I would go to another P.O., farther away, but which was much nicer and staffed by friendly competent people.