I can tell you from first hand experience as a former UPS employee. They are generally terrible in their handling of packages going through their system, especially over-sized or very heavy packages which this would fall into both categories. The system is designed for small packages which can easily move through sorting facilities on a belt and slide system.
Large heavy packages are supposed to be moved around by hand on carts, but the employees are not paid well and will force them onto the belt system where they get jammed and twisted around corners. If they do put them on carts, it is not usually a gentle process. They are supposed to use 2 people to move large heavy packages around, but usually don't have time to get help, so they do it by their self usually with some kicking and dropping of the package.
Then once it gets on the delivery truck, it is a big headache for the driver. It is usually blocking half his truck and he has to move it by himself which may involve some more kicking and dropping.
So by the time it gets to you the customer who has ordered it, it has been kicked, dropped, slammed around, twisted through belt and slide systems several times. So the fact it even made it at all with all pieces still there is amazing.
