lol I found mine, folded behind the seats, a few days after I took delivery. My Z came right off the truck. I bought it with 4 miles on it. They hadn't even PDI'ed it when I first came down to buy (had to wait a few days), so they had never put the window sticker on it, just folded it and put it behind the seat, knowing I was coming to pick it up two days later.
I still have it.