I have had problems with both USPS & UPS getting stuff to me & found that it's the mail man or UPS driver that left packages at other addresses most of the time. I really despise my Mail Man and complaining to the PO has got me nowhere , delivering packages to the wrong address, leaving packages in the rain uncovered ( this is my biggest problem with him ). I like the manager of our PO, she has found a bunch of stuff that was said to be delivered but wasn't for me in the past.
I once had a package sent UPS that said it was delivered when it wasn't, I called to find out what I could do about it and got a huge run around, then about a week later I found it. Driver put it in a Car that I had for sale ( which normally was locked ) on my property, I didn't think to look there lol.

Glenn