I suspect that the seller packed the unit poorly, and it may have been in bad shape before it went out the door. Sorry to by cynical, and surely I could be wrong. Everyone knows UPS is pretty brutal with packages. But my experience with UPS damage is that mishandled packages usually burst open or at least show external signs, crushed corners, torn sides, that sort of thing. The inflated bags take the hits better than the box does. So I'm thinking that it may have left the place in bad shape and that the airbags were already deflated.

Then again, you probably have little choice but to make a UPS claim or eat the loss. I doubt the seller will take the deck back, and I know you're not the kind of guy to resell it in that shape. There is a chance that the package was damaged in shipment rather than being sent that way, so filing a claim isn't out of the question. UPS reserves the right to inspect the box, but they probably won't take the trouble because the cost of the loss doesn't merit it. You'll probably fill out some paperwork and get a claim check in a few weeks.