I don't mean to be a dick, and I'm sorry you suffered a loss, but what baffles me is that anyone would leave their coins in any webwallet, and especially an anonymous mixing service that operates on the onion network. That's just trouble waiting to happen.
You're not being a dick, these are valid questions. I used Blender for years, he was hacked, replace everyone's coins, he definitely seemed to be honest about the service. Regardless, three days is too short to shutdown a service like this and from speaking to multiple people he was paranoid when Bestmixer was in trouble. He destroyed the server though on June 13th he moved all remaining coin to two seperate addresses. It stinks and he is an asshole for not giving people more time and exit scamming.