It's kind of unclear on that options doc.
It could also be interpreted as clear glass standard, but only coded if AC is ordered and no tint desired.
There are no "S" codes for either tint option, indicating that might be the case.
I'd be tempted to get the "patina" paint color matched and respray the engine compartment and underside to match better.
(I could possibly do that myself)
I agree. So, it may be the original paint, it needs painting anyway. I think the car has a body swap. It's still a fun car to have, just may not be an original fun car, but still a fun car. Sale it as a fun car and be done with it.