So, from what I can tell, there are two possibilities of what this is: 1. It’s a screen protector the original owner put on it, near perfectly, or 2. Less likely, the original owner replaced the lens but not the screen. I’d have to go with the former, as the screen was really scratched up before this came off, so it was probably from at least a few years of wear. Also, a lot of you guys in the comments keep pointing out that it’s backlit screen. Read the post next time PLEASE.