Is this a problem solely affecting black N9s, or have I got this fun and games to look forward to on my cyan one? Do the cyan and magenta N9s also have some kind of paint finish? I just looked really hard at mine and I don't think so, but I'm about as expert as a goldfish brain surgeon.
Your device is fake. The body is not made of polycarbonate and the SIM latch is not made of ordinary "Nokia quality" plastic. That's my best guess so far.
I know NOTHING about painting and plastics, I am more of the ITer and do not even own an N9, but is it really impossible than to give the matte look nokia used grey PC and sprayed it with black matte paint that might peel off under sweat or whatnot?? Otherwise there is no other possible explanation unless, parafrasing Valve's Portal, "The polycarbonate is a lie!"
EDIT: This actually is exactly the same that happened to the back matte part of my old N95 8GB, lets see if I can find a picture.
Perhaps if someone could post a few proper close-up pictures, that would help to solve the mystery and settle the argument. Use a real camera (not a phone cam) with a macro function, shoot from the right angle with good lighting for a crisp, zoomed-in picture of the damaged areas so we can see if it's peeling or just grey underneath.
Nokia did make a big deal about the N9 being thoroughly colored polycarbonate, so I'd be very surprised if that turned out not true. Is there a matte paint layer on top of the black PC? I don't know, but a good picture might help to tell.
That said, I'd also not put it beyond some companies in China to get spare part interiors, couple them with knock-off housings and sell them as genuine N9s. Especially when it's all overseas customers who can't go after the company.
