Out of curiosity, is your account hacked? Are you able to sign a message from 1NkCr9EUZuhQsvbipYD2rbihQmX9rmaQps which I have a good reason to believe belongs to the original owner of your account.
I've got the old Blockchain.info identifiers however I've been having trouble trying to decrypt them. Not sure why as I'm using the password that I've always used so I contacted support to see if theirs a way I can get back in.
I would find it unlikely that the address has spend BTC via the blockchain.info wallet.
I would strongly recommend that anyone dealing with the OP to use escrow.