I'm 100% positive it wasn't tinted before.
I am not, however, positive the previous owner didn't put stupid window stickers up there before.
I saw the car pretty much as it came in, prior to any dealer prep/cleaning. Hell, I even saw the silly alcohol breathalyzer thing in the glove compartment and the ashtray in the back 😛
I can't discount that the previous owner didn't have those stupid decorative stickers they put in the back though so that might very well be the root cause.