Five days after the Silk Road takedown and Ross Ulbricht's arrest at the Glen Park branch of the San Francisco Public Library. The takedown is interesting more for what it tells us about Tor's anonymity guarantees than for what it tells us about Silk Road itself.
Two careful people, both of whom should have understood the threat model, used a shared-draft-folder scheme that should have been operationally adequate. They were exposed within months by an investigation that did not need access to the content of any message.