If it was for criminal purposes it would have been easier to bribe a janitor at their office to plug a USB drive into one of their machines for a couple minutes before tossing it.

I'm willing to bet Dave was a government employee, though I won't give up the possiblity he wasn't NSA and more likely some other government organization that needed to stop something yesterday but didn't have the clout to get the big 3 letter organizations to pay attention and help them out