[DW31S]

I'll add my 2 cents. I have worked for a GM dealership for 32 years and before the Obama/GM debacle we had 3 showrooms and five franchises including Chevrolet. I sold new cars (as id my dad, grandfather, brother) there for quite some time, and am now the wholesale mgr. I also ran the new-car get-ready dept. for 3 years, and like one of the above contributors added, the cars were (I want to say thoroughly) cleaned and prepped before retail delivery. We didn't go as far as removing door panels, carpet, or gas tanks, but any paperwork that was found in the cars was discarded. When the cars arrived on the haulers, the drivers had a manifest with the options listed on it and we at the dealership had to check the car against said manifest to insure all the options for each particular car were present. This was an important step in receiving the cars from GM, because if something was missing (and it was from time-to-time) we only had so long to file a claim with the factory. The driver got a copy and the dealer got a copy after we (the dealer) signed off. We threw that paper in the car, and it, along with anything that was loose or visible to the clean-up dept. was thrown away. When I was in sales and we/I delivered a new car to the retail purchaser, any paperwork the clean-up shop missed was thrown away. Often the customer requested that the window sticker be removed and thrown away. It technically was/is against the law to remove that sticker without the buyer's permission. So the amount of build sheets that do exist today is somewhat remarkable considering the amount of people that had the chance to discard them.
Not to deviate from the subject of this thread, but I feel this is also an important fact and could tie in to this discussion; I mainly collect Oldsmobiles and Lansing built cars (the only factory that produced the "W" cars) have YET to have a build sheet like the above surface. I can't say for sure about any of the Chevrolet plants, but in all the years and all the "W" cars, not one "verified" build sheet has ben found. The "key punch knock out" or "broadcast cards" have, but no "build sheets", so maybe some of the Chevy plants that build LS-6s could be the same way.