Finally I get reason why my mtgox.com account was blocked.

anyone can get into situation like mine, when someone sends you stolen BTC, How do I know that BTC was stolen or not?

I never said, but I saying now , that I received from that man from IRC only 9000 BTC, in that day when I received BTC rate was about 0.30/BTC, so it's total of ~3000 USD, so it's necessary to block all my money ( all 45 000 USD) ?

I want to forget this situation and save my nerves.
I agree to return that money(3000 USD) to bitcoin member from which was stoled funds, because it's too small amount to waste my and I think mtgox time, or even involve lawyers. I am holding my BTC ( not withdrawing , or exchanging ) to do this, everytime I am ready to send money. I am asking mtgox.com to tell me bitcoin address from witch was stolen money, so I could send it back.

Also I suggest adopt some sort of rules that this not happen to others.
Also as every website , mtgox.com should have at least some "terms of use" in his website, because he operate with real money, he should explain what realy means "volume" and other terms in his page (it's hard to find out what really
stands behind that word, there is nothing like FAQ pages).
Mtgox.com must warn about withdrawing/depositing limits.