Iphone 5 loose vibrator or camera?

So i got the iphone 5 yesterday and everything seemed normal until i realized how easily i could here a noise inside it. When you lightly tap it or shake it you hear a noise which i assume is the camera lens or vibrator, i know the iphone 4/4s but they do not have the sound to the same extent as my iphone 5. My brother also has one and when i shook his i could hear the same noise but i had to tap pretty hard or shake it alot harder then when you hear it on mine. I did not my iphone and i just noticed this noise. Will At&T take it back with the louder noise and does anyone else have this problem and a fix? And what causes it to be louder in mine then in my brothers

Take it back, you have a 1-year warranty free from apple on any purchase of apple products