It appears that these two Federal agents were doing far, far more than just grabbing some excess bitcoins that were lying around and they figured nobody would miss. It reads more like a purposeful organized crime effort, involving setting up dummy shell companies, forging letters from the government, being involved in pitching investments in shady offshore bitcoin startups, etc.
They also allege that these agents were turning around and selling insider info on the investigation to DPR in exchange for hundreds of thousands of dollars in bitcoin. They allege an agent just basically strong armed some random guy ("RP") who was a customer of CoinMKT and stole $297,000 or so from him, using the Federal Government search and seizure docs to do so but then just transferring the money into his personal checking account.
The agent was doing shady transactions via Venmo and got flagged and had his account suspended, so he contacted them as a DEA agent to get the account reinstated. When they got suspicious (because he had been using his personal email address before going "official") and contacted his supervisors he tried to start a criminal investigation of Venmo as "a suspicious money remitter" through his office.
They allege that the other agent was responsible for the wholesale theft of bitcoin from Silk Road and its various vendors, after they managed to apprehend someone ("CG") who was an administrator at Silk Road. This agent signed Federal warrants seizing the assets of Mt Gox, meanwhile transferring millions of dollars in bitcoin into his own account.
Reading this is thoroughly jaw-dropping: http://www.justice.gov/sites/default/files/opa/press-release...