[Q] Rattling noise when device is shaken or tapped on the back topic

Hi, i recently purchased a z3 from tmobile and whenever i tap on the back of the phone i hear a rattling noise coming from the top left corner around where the camera is. It gets louder when i shake the phone (i've only been shaking the phone cause of the rattling noise) and so far i've read that it could be the camera lens. I was just wondering if anyone had a similar experience and if so how loud the rattling is/was