The simplest explanation is that you didn't expect that someone who bought LR from you, the transactions you've so far claimed are completely unrelated and "for a friend", would match up the LR account to information released much later by aurumxchange.
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.