Rattle Sound in my nexus 6p

[Clocks]

Mine makes a very brief rattle if I knock on the back near the camera. If I launch the camera app and knock it can't be heard. Tells me it's the auto focus.

 

[HawaiiD]

Yep my first nexus had this rattle sound. Try, but not to hard hold the phone towards the middle like when your hold the phone in portrait orientation. Slightly squeeze the middle
Rails of the phone together with your thumb and 4 finger, then release it. Does this reproduce the sound your hearing? My first nexus 6p did this. At first I thought it was normal? But I decided to Google it and vola! My phone was a defect. I took it back to best buy. Waited another 3 days for shipping. The second one is rock solid.
Anyways, I can say that a nexus 6p shouldn't have any sound creaking or loose or vibrating sounds to it when you lay it down