POP and dealer POP questions

[Jeff H]

First question, who actually stamps out the POP for the car, GM or the individual dealer? I assume it comes stamped from Chevrolet with the car. Then the dealer rubber stamps their information and puts the owner's name on with the GM punch tape. But when someone comes in and buys a car new or used and gets an extended warranty, does the dealer now stamp out a new POP showing the extended warranty? I looked at a JL8 car several years ago and it had a POP with the VIN and some extended warranty information like 5/50 on it. I talked with the owner and he verified it was a JL8 car and he had gotten the extended warranty(and needed it because the heads kept eating valves). The reason I'm asking is because if a dealer did an engine, trans or rear swap, would they stamp out a new POP showing the components that went into the car? For example, if Yenko dropped a 427 into a 68 Camaro, would have stamped out a new POP with the engine code from the 427 even if it was just a CE short block? I'm also wondering about this JL8 car at BJ that has the Nov build date and the Jan rear. If the dealer swapped out the drum rear for the disc rear, would they have stamped a new POP showing the new rear? If it was covered by warranty, I would think they would show some proof to the new buyer. Things that make you go hmmmmm????