I believe that the USPS makes service guarantees or promises to companies like Amazon, Walmart.com, etc and won't hesitate to lie to keep their "on time" service promise up. That includes marking deliveries as delivered then bringing them the following day or marking them as delivered at 7:15am when our mail doesn't come until mid-afternoon.
My favorite story - well, not a story, an actual occurrence - is when we had two packages coming from Amazon. We have a street-side mailbox and these wouldn't fit, meaning the mail lady has to bring them to our porch. I guess she didn't feel like getting out of her vehicle that day because she marked our mailbox as being blocked. Proper term she used was "Receptacle blocked". Did I see that on the online tracking ? Nope ! It was on a postcard that she put in our mailbox, along with some letters, flyers, etc.
My favorite story - well, not a story, an actual occurrence - is when we had two packages coming from Amazon. We have a street-side mailbox and these wouldn't fit, meaning the mail lady has to bring them to our porch. I guess she didn't feel like getting out of her vehicle that day because she marked our mailbox as being blocked. Proper term she used was "Receptacle blocked". Did I see that on the online tracking ? Nope ! It was on a postcard that she put in our mailbox, along with some letters, flyers, etc.