Sorry for the problems.
Owner's manual, is an actual required part for a vehicle to leave the factory site, so one was with the vehicle. In some states, it is illegal to let the vehicle go without an Owner's manual.
Including what everyone else pointed out:
Onstar booklet
Maybe some XM information (can't remember)
Tire warranty (sorry doesn't cover punctures)
I would scream like bloody hell at the dealer's manager, then call Hummer Assistance and place a complaint.
I have a pdf file of the owner's manual I can email you, it does not replace the paper one that is supposed to be in the glove box, but could give you some "bathroom" reading.
