'71 rimblow wheels are the same as '70, and they often didn't appear anywhere in the build info. '71 was the last year for the rimblow wheel option, it was discontinued for '72, and they just put them on a lot of cars at the factory to get rid of all the extra stock. At least that's the popular theory. Lots of plain jane '71 cars ended up with rimblow wheels.
My EL5 GT had a rimblow wheel from the factory, and there's nothing on the fender tag or build sheet to indicate that it came with one. They often came with the GT package, but it wasn't on the list of included options. I suspect my other GT had one as well because the steering wheel was replaced with a cheap aftermarket wheel, but that car was parted out by some a-hole who took all of the expensive items- 8 3/4, bucket seats, console, etc before I got it.
So, while it might not be "correct" for that car, there's really no good way to prove it is or it isn't because of the number of cars that had them from the factory without documentation.