Has anyone used this case before? I bought a white one yesterday for my 5 and I love it's incredibly slim profile...like I don't have a case at all! BUT the back already has several scratches and it hasn't even been 24 hours! Is this normal or did I buy one that someone had already used? I didn't pay attention until this morning when the fluorescent light in my office made the scratches obvious. I'm trying to determine if I should take it back to Best Buy and exchange it...