Sergey Medvedev, who runs a darkmarket that sells fake documents like fake identities and credit cards, also likes to hang out in Thailand. Who doesn't?
Thai authorities recognized him, and confiscated 100,000 Bitcoins! At the current price that's about $850 million USD. There was an international investigation into his dark marketplace, called Infraud that resulted in the arrest. It is unknown if he will be extradited to the United States.
Police raided his house in Bangkok, seizing 29 electronic devices. I suspect they'll try to find more wallets, exchage accounts and whatever else they can of value. Total estimated losses suffered by victims over the past seven years during which Infraud has been operating: $530 million USD.