UPS, for ground shipments most especially, uses a massive, automated sorting system to sort and process shipments. I've seen video of this somewhere and it is truly huge and impressive. They use bar code readers everywhere to divert boxes off of the miles of conveyors to sort shipments - the bar code is read and bang, a gate swings open and off the box goes off on a different line. This works great until something hangs on a gate then tons of crap pile up behind the snag and stuff gets crushed or pushed off of the conveyor to ground, which could be 20 + feet below! I've had repair parts delivered for more than 20 years via UPS and they do a damn good job but I can just about guarantee which types of packages get will get damaged. You have to plan ahead for this kind of abuse - if things were hand sorted it would easily double or triple the cost.