Default [Q] I see 2 tiny silver lines under the front glass. Is my nexus 4 defective?

* Please take a look at the attached picture for easier understanding.

I've been using my Nexus 4 for a week until now, and someday I looked at the top bezel carefully, (with proper angle & light)

and I found out that there are 2 shining lines under the glass. (As you know the bezel is supposed to be just black without any decorations or marks.)

The right one is right below the front speaker, and the middle one is right below the perimeter dividing the area in half.

They are very short(like a millimeter), and shiny like some kind of metal. They look like some cracks of the bezel.

But the front glass is just fine and there are no scratches on the surface now. And I never dropped or hit my phone.

I'm not sure the lines are from the beginning or created after unboxing.

Anyone sees the same thing or knows about it?
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