Slight Nexus 4 Issue

I've had my Nexus 4 for a couple of weeks now. I bought it off of ebay new, for a fair price.

But I've noticed that on the soft touch plastic banding, around the upper left hand side there's quite a lot of flex. I can push it a bit and it will creak and click a little.

Is this enough of an issue I can contact Google about to get a replacement? Anyone else having any similar issue?

It's definitely down to build quality and not me. I noticed it as soon as I got the device but it has got creakier as time has gone on.