Here's what I'm guessing is happening. The person who hacked bitfinex is now trying to launder the money. Here's how.
Declare a "giveaway" where you give 1000 bitcoin to some "random" person who posts there address on several different bitcoin forums.
Post an address yourself to one of the forums.
Wait a week, and give the money to the address you posted.
Claim the money wasn't illegally gotten, but from this giveaway.