Delivery Guy Bent Both Axles & Driveshaft

[b-mac]

Damage question - Wrong Year - Because I trust your opinions...hope mods don't boot me.

Our 2016 1/2 ton Chevy at work, has been at the dealer shop with a rear end vibration. I never drove it. It was taken in after it came back to my warehouse with a blown tire...that I was told there was a piece of metal in.
The dealer has called me as said that the REAR SHOCK WAS BLOWN, BOTH AXLES ARE BENT, and the DRIVESHAFT IS BENT.
There are no visibal impact marks on the under side of the truck.
My older trusted couter guys think it is a known 'shimmy' problem with GM trucks that has been reported elsewhere online.

Just want to know what you guys think. Do you think it's possible my delivery guy did this damage? I've been pretty hard on some vehicles in my youth, and I've never blown a shock, or bent and axle.