I don't even have a wife this time of year. She's about to kill herself just making sure that stories like this don't happen on her watch. You wouldn't believe the stress that Ama666on puts on them. Meanwhile, people order packages 3 weeks before Christmas and don't even want them yet, but if they don't get their in 2 days, the USPS does not get paid. At all. If it's not scanned "delivered" by the end of the second day from order, Ama666on doesn't pay the PO anything for that package. Even if it got to the post office at 2:30 that day because their truck was late, and the mail carrier is already 2/3 way done with her route. They don't care, and they take NO responsibility for their side.
No excuse for the clown show that 11T has been going through. But all of you saying "they should see this coming and staff up" don't really know the scale of what you're talking about. You can't scale a business around a 2-4 week period where your volume is over 10 times higher than normal. And in the case of Ama666on and the post office, it's not just the sheer volume, it's how poorly that volume is handled at some parts of the chain (as I mentioned above) and then all the strain getting put on the back end. But, I have friends and clients that work for UPS as well. They do bring in college kids as seasonal workers but they can only work in the plants/sort centers. My friend that is a driver for them makes so much overtime in December that it's crazy.
They all get stressed to the breaking point, volume wise, at this time of year. It only makes sense that no matter what their "normal" service level is, there are going to be more problems and screwups now than maybe even the other 11 months combined. And, as more and more people order Christmas gifts on line, it's only going to get worse.