[TimG]

I know that special paint does not show up as COPO in the box on Corvette paperwork. One '65 Corvette that was ordered as blue with red interior is always referred to as a COPO. The same with the few silver with red interior '67 Corvettes. They are always referred to as COPO cars.
The '73 Black Corvette that was owned locally and also by a member of this forum didn't have COPO anywhere. The only reference to paint color was "Black" written on the build sheet. The window sticker showed "Special Paint" with a cost only.