Not sure about the stickers, I've haven't had a GN since a Dynadrive back in the day so I can't comment but the bat looks pretty good to me.
If I was the seller I'd be pretty annoyed. Hardly fair to start asking questions AFTER you've bought it. If you weren't sure you shouldn't have bid on it in the first place thereby allowing the seller to sell to someone else. And after you have won you should have paid for it and gone through with the deal. If, when you receive it, there is a problem then open a dispute etc but all this talk about it being iffy is hypothetical as you haven't even seen it in the flesh! For all you know it could have been the deal of the century.
Most unfair on the seller if I'm being honest.