Question on water damage indicator topic

So I just got a z1s from T-Mobile and was looking under the flap on the right side of the phone and inside the flap on the bottom there is a little red square. I was wondering if that is the water damage indicator so I can go complain at the T-Mobile store if it is already "water damaged".

I have not gotten it wet at all since I got it, so hopefully everything will work out fine.