Bro its too late. He can contact ebay all he wants. The grace period is over. Trust me I know. Don't worry about it and ignore the emails. Who cares if its his dad. Don't worry about it. Ebay has a 30 day grace period for any of their claims. Once the grace period is up its too late to dispute. So again like everyone is telling you forget about it don't even bother replying to them. Your getting played man... do you actually know the mechanic is his dad no you don't. Your going by the kids word and what you see on your screen. Again ignore his ass... too late... times up. If his dad is a mechanic the transmission would of been in a long time ago. He's giving you stories first it was any mechanic now its my dad is a mechanic and he put it in. For all you know it could be his dad which is not a mechanic and try to install it himself. My dad is not a mechanic and rebuilds motors, installs clutches, installs transmissions, etc. My dad was never a certified mechanic either.

You are stressing this too much. Forget about it and don't reply to the emails. If he wants to contact ebay let him. You wouldn't be obligated to pay for the parts either. Thats something they did and its their problem now.

Let them deal with it. Funny how a month later they get the tranny and then install it and come to find out it doesn't work. The transmission is probably working right now in his car and he's trying to get his money back for the old one that was in his car that he fucked up. It's like me buying a motor from ebay... in perfect shape... its runs and everything and its fine. I take my old one that spun a bearing and say hey you sold me an engine with a spun bearing.

Don't fall for it... forget it... stop replying to the emails.