BurtW was arrested on October 14, 2014, and bitmixer's forum auction bid was rejected by theymos without explination on December 7, 2014 (only 3 weeks later). This would fit a timeline of theymos getting some kind of subpoena asking for information about both the bitmixer.io account and the BurtW account, and if bitmixer.io was compromised as part of the arrest, it would fit the rough timeline that it would take for the government to take over the service and familiarize themselves with a good way to track all the coins that pass through it.