40gb ps3 with joker

[xBlade]

Hey everyone i just stubbled in here while looking for information about a ps3 40gb im going to be buying next week. It has the joker from arkham asylum on it and its not a sticker. It feels and appears to have been done by sony and not painted by someone. It as been clear coated and smooth but cant find any information about it at all. So i thought id post here to see if anyone knows anything about it. I mean was it a promotional ps3 or a limited edition or anything like that? Im getting it because im a joker fan and looks great and to add to my collection but want to know if theres any real rareity to it at all or if the artwork had to be done prior to boxing and selling or after purchase by the orriganal owner. The person im buying it from said he knew the owner when he bought it and was like that when he un boxed it but dont know how true that is. Well any information would be helpful because ive hit the brick wall on google after days of looking.