Sadly. There is a simple way of determining the w800i is water damaged, that little puppy does have the sticker. It’s on the battery as far as I remember.
Soooo…
I suppose if you really want to try and fool em, maybe in a purely hypothetical world, you could, oh I dunno, swap batteries with someone. Only thing though, if they send it to be repaired, it is very obvious at that stage that the phone is water damaged. But for a hypothetical over the counter exchange, yeah, swap batteries.
Shhhh…