I had similar personal problems with Gladiator cabinets. On a Toolguyd post back in January 2015 I said:
"I bought a pair of GAGB272DRG rolling cabinets at the end of 2011 … I like them very much – but had a back-and-forth delivery and return issue – with pretty severe damage to the doors – until Amazon finally shipped me ones via a delivery company – rather than UPS/FedEx. I’m not sure the issue was with the delivery folks as much as flimsy packaging for such a heavy item. You would think that Gladiator (a division of Whirlpool) would have known how to package to avoid damage – and maybe they’ve improved things. "
On much sturdier Knaack boxes we had problems with one delivered to our workout center - arriving damaged. It looked like it had been dropped on a corner. The next one we ordered - we had delivered to a Home Depot store for pickup - so that we could inspect it. We had a crew with one of our box trucks with a lift gate go and inspect it and bring it back…
I think that if I were buying more Gladiator cabinets - I would use the same strategy - and tip the HD guys to help me load them into my pickup truck - once unpacked and inspected. Unfortunately, I don’t think HD sells Proto tool chests