If you can't supply the original discs it's illegal to sell (and buy!) that harddrive with games on it. (you can include an empty harddrive no problems)
Pictures could help to determine the state of the hardware (if the wiimote looks all scratched and ugly it's more likely to fail as it's probably not handled with a lot of care)
Also, this post should be in the buy/sell/trade forum I think. Not newbie discussion.