My car was restored in 2007, 8 years before I bought it. It seems to be the original trunk lid, since I do have a date on it. It'S an original part anyway.
I do believe that my spoiler was added by the dealer once upon the time, and then in 2007 when the car was restored, they repaint the inside as well, so make sure the holes we're well covered with paint to avoid future rust problem.