Has anyone found their iPhone 5 aluminum back show strange wear? Mine looks overall really nice, no new nicks (it came with a few from Apple). However, I keep mine in an iPod Sock (hold the laughter). To the point, the slate back of the phone has all the socks ribs in it, like a pattern. It won't wipe off. The ribs of the iPod sock pattern can be seen in the slate back of the iPhone 5. It's not scratching or anything, it's just like you see the pattern if you have the phone at the correct angle. Has anyone else seen this? I guess it is the metal changing color or something from the contact with another material?