From the link I dug out in the above comment "According to an investigation conducted by the Criminal Investigation Division of the Internal Revenue Service an

From the link I dug out in the above comment "According to an investigation conducted by the Criminal Investigation Division of the Internal Revenue Service and the U.S. Attorney’s Office for the Northern District of California, Individual X was the individual who moved the cryptocurrency from Silk Road. According to the investigation, Individual X was able to hack into Silk Road and gain unauthorized and illegal access to Silk Road and thereby steal the illicit cryptocurrency from Silk Road and move it into wallets that Individual X controlled. According to the investigation, Ulbricht became aware of Individual X’s online identity and threatened Individual X for return of the cryptocurrency to Ulbricht. Individual X did not return the cryptocurrency but kept it and did not spend it. On November 3, 2020, Individual X signed a Consent and Agreement to Forfeiture with the U.S. Attorney’s Office, Northern District of California. In that agreement, Individual X, consented to the forfeiture of the Defendant Property to the United States government. On November 3, 2020, the United States took custody of the Defendant Property from 1HQ3."