Used S7, need to know if it is real

A

AC Question

I bought a galaxy s7 on craigslist. It was listed as new Verizon model

It works well and I was able to get it to work with the sim.

I have never seen s7 before this but on this one there are small squares around the back and menu button and a number engraved in the left upper bezel to the left of Samsung logo

I did not see this in the s7 in another store after I bought it, also a Verizon model. The phone has a clean emei

Can anyone tell me if this is some kind of demo unit and if there is a chance this is not the real deal or the glass was replaced or something like that