this doesn't have to mean anything. there is nothing significant at this address except useless shit tokens. the last transaction was a year ago, and then all Ethereum was withdrawn, the only thing worth there. very possible right before the sale.
scammers and account resellers know about this type of check and there is no reason to give a private key from some useless bounty address, just as they give access to the email address to which the account is registered.
I wouldn't trust this account for a more serious trade, especially not after dubious merit transactions.