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Can you sign a message using this Bitcoin address you posted? That should clear things up.
Add me please.
13Trr89nfFvqeWndchD4nbbPKYS1LVuc9P
The original owner of the account could have possibly provided the private key when the account was sold. It would not prove anything.
EDIT: Although I would find it somewhat unlikely that the buyer received the private key as there are unspent inputs in the subject address, it would still be possible the private key was purchased as well
Anything is possible but for the majority rule I'm sure many would agree, sign an address that you posted here on forums from early 2014 or previous to prove you're the original. Or have Tecshare vouch that its still you in the account.
By the way, quickseller you now are -6 trust (TRADE WITH EXTREME CAUTION), enjoy the red world with me, its bullshit I tell you.