So, I have done a deal "for a friend" on AurumXchange using my own account.
And I have also done a deal "for a friend" on QQ using a friend's account?
Both happened before I had any clue of the investigation.
I did the deals, but all in much larger amounts with my own account.
So, this deal you did with a "friend's" account just happens to be the same account as "the hacker" created? I'm sorry, but that explanation can't even begin to satisfy your own quest for consonance.
http://en.wikipedia.org/wiki/Cognitive_dissonance#The_Belief_Disconfirmation_Paradigm