Attention: Help Fight A Scammer

Okay.

So, long story short. Yahtzee! was banned from the sythe.org forums for fake vouching The Josiah. His story is that he claims never to have known who the person was, and that the person was starting a gold shop and they needed a vouch to get them started.
Anyway, I sold the account "Amp" to yahtzee!, and soon afterwards he was banned from the forums. Once I found out I was completely irate, knowing that Josiah has scammed 20m off of me in the recent months, no joke.
Anyway, I am trying to figure out who this person is ingame 'c wars medic'

Like I said, long story short. After I found out yahtzee fake vouched josiah i became irate, and had the REAL owner the account take it back for me. I am now in posession of the account, and me and yahtzee are discussing who should keep it. The only way I am going to allow him to have the account back is if he can prove that he is not this 'c wars medic' character.

That person tried to scam the fuck out of me, and its only one of two people unless I am told otherwise.
Yahtzee, or josiah.
So, I ask that anyone with ANY information please help me out as any leads should help me determine whether or not to give the account back.