From what I understood it was supposed to be automatically returned to you 1 week after the results come in.
So let's say you entered the round for the week ending Aug 2nd. You would have entered the round on or before July 29th. The numbers for that round would come in around Aug 5th, and the results with your winnings should be around Aug 12th.
However, there are quite a few rounds outstanding right now, and I don't really have a clue when we will get them. Only ioi knows, pm him.