There is compelling evidence to show that the OP sold this account and is now fraudently trying to restore it after receiving the payment. The negotiations took three days, the OP's account was created on the last day of negotiations after the deal was made.
The length people go to scam on this forum is incredible.
It looks like this user is trying to steal an account with zero proof of anything. If he had signed a message then theymos would have reset the password email for him so he can reset his password.
This is a new low for scammers.
You've gone from trying to be the original owner to saying the account was purchased...odds are not in your favor.