About 20 years ago I had the opportunity to observe the trucks being unloaded onto a belt and the packages picked off the belt... yes, they do throw them. No time or space to set them down gently. I'm sure the process is not slower than it was, too.

I also got to put on a set of "browns" and spend the morning with a driver in his package car (what UPS calls the delivery step vans). That driver was really earning his pay that day, and glad to have a helper. It's not an easy job physically, especially with the red tag (70+ lb) packages.

However, I would not expect to see a tire track printed on a box, or a forklift tine punched through it!