In our area, orders are delivered by UPS or USPS - no direct-delivery from Amazon yet but I'm sure we will soon. There is a Amazon warehouse about an hour drive away, another 1-1/2 hours, and one being built that's less than 30 minutes away.
With UPS deliveries, never had a problem. With USPS, it depends on how hot outside it is and how lazy (tired) the carrier is. We have a roadside mailbox so many items don't fit, meaning she has to get out of her vehicle, walk 30' (the driveway is sloped, so it's "uphill" and in the summer, the concrete is hot), and carry a heavy 2# package, so I get it.... 1 out of 4 packages are marked as delivered when they're not though they almost always show up the next day. A few times they get delivered to a neighbor with the same house number but obviously a different street and they'll bring it to us. One time, they were expecting an Amazon order, got mine and opened it. The lady wrote an apologetic note on the box and apologized to our son when he answered the door to get it from them. I just laughed about it. We get their mail occasionally too.