Zegapain
kirokoda
Yes... As far as I know they do that for tampering..it weakens the sticker so if you try to remove it, the sticker falls apart.
So is the warranty void if I wanted to install a water block later on?
No, as long as you return the card to its original state for rma your fine. This just tells EVGA team that it was opened and to inspect/test further when necessary, not everyone actually opens up the whole thing so it just speeds up the process when they don't need to.