That must be very stresful experience. However I'm not sure how could you wallet be empty if you had powered up your STEEM. Wallet cannot be "cleared" before powering down everything. And it takes weeks.
I tried logging in with my Master Owner's account, but nope, everything thing had been changed.
Oh shit. Even knowing your own master key didn't help ?
Glad to know you managed to get things on the right track! Upvote on the way. Catch :)