>> "That said, the FBI probably just imaged the drives. They're not as clueful/devious as many think they are."
I would agree, but it also doesn't seem like some kind of act of charity that they plugged the thing in and tried to reconnect it and made sure it was apparently working before they left.
Correct. But the guys were probably Special Agents and were from the data forensics group that are recruited into the DoJ specifically for their IT skills.
It's also possible that there was a Special Agent + Contractor team working.
BTW, they are probably not very happy that video evidence of their activities was captured and published. Don't look for them to make that mistake again.