I guess he isn't joking because he is still selling the wallet up until now. It has been a year and it seems no one is interested in the offer. Did they think that the OP is only lying and he did not really lost his password? Brute forcing the wallet to access the funds can take a long time and before the buyer access the funds, the OP already moved them in another wallet.

If the OP is telling the truth, he better ask for a help on how to recover his password, I think there are people here that are expert about this but he only want to make sure that those people are trusted. It is possible to know by simply looking at their trust score. They might only ask for some donation or tip if the recovery is successful.