I've asked Cryptsy 3 times if they can comment on whether it's their cold storage wallet, but they have not responded.
There are some amazing coincidences that keep me for ruling out Wolong. His announcement of his pending ForEx service the same day after months of silence, and then there was that weird chatroom "leak" months ago where (presumably) Wolong said he would use Uno as an arbitrage instrument. Take it all with a grain of salt...
Maybe we should try this: pick a time, and everyone withdraw their Uno coins to their local wallets from cryptsy all the same time. Then we'll see if they have to tap cold storage to honor the withdraw requests.
If we pull out 10k Un, maybe it might force Cryptsy to tap cold storage and we'd see it move. Or... on the other hand, if Wolong is reading this all he needs to do is move some coins on that same day to screw with us. But maybe we would find some blockchain evidence... maybe not. I guess there's really no way to know for certain unless Cryptsy or Wolong offers an explanation.
If it's not Cryptsy's wallet, remember that all of the coins in that wallet were acquired on the market; they're not part of any premine scheme. While it skews the distribution on our Chainz explorer, they're still fairly acquired Un.