In many cases, Amazon will go directly to the local po and drop off pallets of mail for that town. When that happens, you skip the time the mail might sit in a trailer at a facility waiting for that understaffed facility (some facilities are actually closed. Usps, fedex, Amazon) to get to it.
For the most part, you are wasting your time complaining at the local office. Everything that gets dropped off at the local office goes out to facility every day. Everything that the facility delivers to the local office each morning has to be delivered.
Your mail problems are from understaffed facilities and there also not being enough truck drivers. Your receipt makes you think your item is lost. It's not lost. It's sitting in a trailer. Your receipt makes you think your package is going somewhere that seems out of the way. It is. It's being diverted to a facility that can supposedly handle it.
I saw a story dated Dec 15 saying there were 14,000 usps workers out on quarantine. That's the number they tell you. It was probably more. It's definitely worse right now.
So the more people stay home and order stuff, and the worse covid gets, there is no way to see things getting better, because that means more and more packages, with less and getting lower amount of workers. And it's not just the usps. It's all these companies.
My Black Sabbath 5LP Super Deluxe Paranoid box set was ordered Dec 2 and delivered Dec 28. Extremely aggravated about it, but it is what it is. The website actually stated on it's home page that there can potentially be mail delays because of covid and the holidays. I read it and still ordered.