Awesome tip, but I feel like I'm still shit out of luck with any Amazon purchase sent via USPS. Their drivers mark all their Amazon Prime packages as delivered if it's end of day. I've had multiple Amazon deliveries that were "delivered at 7:59pm at normal mail reception desk" that they then delivered the following day

EDIT: Just want to make it clear that this isn't my isolated experience -- http://www.cbs46.com/story/36856477/mail-carriers-usps-warns...