Wow I've been gone for months...and suddenly it's all happening.
Digital evidence does everyone in, eventually!
I applaud the FBI, Rexburg PD and Fremont Sheriff. Digital evidence is not easy to sort through, but, they didn't go there today without a pretty solid idea of where to look. All my opinion only, of course, but, as a techie, I can say that there's a lot of sources of satellite imaging and it's fairly easy to see when something on a piece of property changed. Overturned dirt has a signature that isn't easily missed.
However, even accused criminals have rights, and this is the type of case where LE cannot afford a mistake.