I took the tour and orientation for UPS and seen first hand how the employees treat shipments here in Houston. One person drags a conveyor into a trailer and has to unload that trailer in a specific amount of time! UPS is the worst at package handling. I always ask for an alternative to shipping to avoid The Brown Truck!!! CARELESS!! They throw that stuff around like its garbage!! I could not believe how many packages were in the damage bin.
It also is the responsiblity of the seller/shipper to pack the product so there is less chance of product getting damaged. I too sell many parts and take care in boxing to be sure buyer gets it in the same condition as when I had it!! I shipped an Auto console in perfect condition to California without any damage, it can be done!!