They are aware of the issue. They did not openly admit to connecting the battery backwards (that's the only thing I can think of that would cause sooo many fuses to blow), but they seems to acknowledge that the car was in perfect running order before they got their hands on it. The ECU doesn't seem to have been damaged, but I haven't opened her up since the issue...
I'm taking her to a shop tomorrow to determine what's wrong with the deck. I'll have them do a complete electrical diagnosis to see if something else comes up.