How do you know it's stolen from Cryptopia? They never posted any TX and never disclosed any amount stolen. All they said was "significant" and "9.4% of total holdings". Why do you think they kept these a secret, I'm interested to hear your opinion.

As long as nobody from Cryptopia indicated ETH was stolen, I don't think it's up for us to say so. Why should we accredit the ideea of stolen, when there are other equally probable situations?