mistermumbles: Not quite true. ...
;-) I know, I know, Witcher 3 is among the very few exceptions, where you can get GOG keys from selected known distributors as well, but definitely not from classic resellers, let alone ebay shops. Anyway, you can't possible recommend buying it at Humble, Amazon or even Origin, especially when there's a sale just around the corner at GOG's. Hence I didn't even went there with my argument. The behaviour and offer of this ebay shop is suspicious at best. To be on the safe side, he really should get a refund and buy it here.
Btw, as far as I know most of the codes included with GeForce offers, expired in 2015 and it wasn't allowed to sell them separately.
Rickett: ...They fist ask me a copy of a personal document, now they want my gog account name and password. Im shocked considering the amount of positive feedback they have. ...
Since Asbeau knows of shops creating GOG accounts to sell games (which isn't allowed by GOG's terms of use either) it's probably a bit far-fetched, but there's another idea. Are you absolutely sure, it's the shop asking you? You could be target of an attack. Maybe someone pretends to be the shop to get personal information, like copies of said personal documents and your (standard) password. However, don't send anything more.