Our Post Office has gotten a little better in the last year about delivering packages. Although they still sometimes try the wrong buzzer.
One thing, with your postal slip you can schedule to have it redelivered through the USPS website. I have had good success with this.
https://redelivery.usps.com/redelivery/
Fortunately very few of our Amazon deliveries are USPS, most of them are UPS.
And then puts the key in someone else's mailbox. So you have to wait for someone to check their mail and then hope they're nice enough to notice the package that arrived was not for them.
UPS, FedEx, etc, are allowed (if the resident signs a waiver) to leave packages with building management in their package room, after which point the night doorperson will email you when your package is ready to be picked up.
I will choose non-USPS every single time I can.
There's no accountability in these post offices for how they deal with their customers.
I'm glad almost all of my Prime deliveries are via UPS or FedEx. Occasionally they go through USPS or through them via FedEx SmartPost and those are the only ones that ever have problems.
My post office in South Carolina is pretty crap too. If the carrier calls out sick, nobody delivers the mail that day. Every once in a while there will be several days of this and then my mailbox is stuffed with all the mail I should have received. Or something arrives 6 months after it was sent.
In Columbia and/or Charleston, I have never missed mail on a delivery day because the carrier was sick.
I have, however, had them not deliver the slip for a signature-required package, then try to blame it on me. (I still try to figure out how that one is my fault...)