The individual who mined over half a million coins in a few hours has made that claim public (specifically 520,000 in about 8 hours if I remember correctly). He also claims to have sold them I believe around at 10k satoshis. And he is quite present and available in another forum, so no mystery there.
so where exactly is that? link to the post and the forum would be good, not everybody spends all his days browsing crypto forums. i usually do not even visit other threads than this one and no other forums at all.