every dog dish ive ever seen came in bags like this or the ones i described earlier...
I worked at a GM dealership too.. new car prep..no boxes...boxes where intended for service parts or counter sales..if it came with the car..it was not in boxes...it was either wrapped in paper..or a little later they where in shrink wrap..never intended to be boxed and sold..that cost money to box and label...i believe there was a pick tag on parts in the trunk..and GM was frugal....but dealerships did what it took to sell cars..you want 15x7 rallies on your 6 cylinder Nova..you got them..the sale happened...
of course, theres exceptions...always...i believe if a boxed and part numbered part was in a trunk, id guess they where added by the sales dept or service..at least thats how i remember it..but a lot of time passed..and it didnt really matter...they where just cars being sold and delivered...i worked at a dealership in the 90s also..and i dont remember any boxed parts either..but i've drank a lot of beer between then and now....
also, ive had a ton of inventory..bought and sold a bunch...i cant tell you how many dog dishes i have had that had the part number written in pencil on the inside....they came in trunks, and never made it in a car, and the dealership put it right in inventory...no stickers..no labels...just plain old #2 lead pencil...
again..GM boxed and reboxed a bunch..ive seen old date coded stuff in brand new style boxes..if the package was damaged it got reboxed
theres so many variables..who knows..what one dealer ship did may not be what another would even consider..they where moving cars
