What I hate is when someone comes to your house, looks over the UNSHOPPED game thoroughly, then calls you back a week later to tell you what's wrong with the game, and wants a partial refund (buyers remorse).
I just say, nope.....this game was sold to you as is, you had every opportunity to look it over......BUT I WILL TAKE IT BACK FOR A FULL REFUND. Then never sell them a game ever again. You don't want someone like that with your game, to bad mouth your reputation, saying you made them a bad deal. So take the game back and sell it to someone else.
If I go to your house, look over the game, and negotiate a price to buy it.....its on me. More and more people want sh*t for free, and must want you to warranty a 20 year old game, but don't want to pay a retail prices.