They always make a big announcement right away after major busts. They even plastered all their alphabet soup agency logos onto the Silk Road 1 site when they shut it down. Have they found a way to find these DNM servers, and just keeping quiet about it so they can maybe find other Market servers in the future and shut them down? Are they about to shut down other sites, and just waiting on that to make a big announcement?
My theory is that AB actually didn't get busted. The news got their information from peoples theories on reddit, and then published the article, (wouldn't be the first time the press has used random reddit comments as factual sorces) and now everyone beleives they got popped, but AB actually exit scammed.