Wirelessly posted (iPhone 4s: Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_3 like Mac OS X; en) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8J2 Safari/6533.18.5)
Mine was flawless when I got it. If it really bothers you, exchange it. Just remember, even with a hard shell case on it, you'll get the same marks over time.