So then 500 isn't a concrete number. That could be 1000 or any number considering the only way to really validate one is by buildsheet or original order form (maybe window sticker

) and not many have survived with their cars. And there is no list of VIN numbers as with other COPO cars...
Authenticating one by inspection would be next to impossible considering that there are no key identifiers on the spoiler. And drilled holes are well, drilled holes. And everyone installed the 3 piece spoiler back in the day. So without an actual figure seems like the number is unknown. I'm no expert and I am not discrediting the cars, just seems logical..