grounded our Prius out on a tree stump

Hey everyone. We've had no problems with our Prius until now. Now we have two. My previous thread is about a brake chort, chirp, noise, and is not a result of the incident I describe here, as the incident followed the onset of the noise. In short, we ground out on a tree stump in the very crude camp ground road. The stump hit somewhere in the middle of the underbelly of our previously perfect Prius. We hit fairly hard, but were going slowly at the time. I looked back and saw a part fall to the side of the car. We snatched it up. It appears to be a cover for some cables, electical wiring. it is about 4.5 inches long and about 2 inches wide, and is molded to snap onto some type of wires. Maybe there are 4 wire molds in this thing. Any clue? I will be taking it in to the dreaded dealer, but would like to have some idea what I am dealing with before they get a hold of the car and our money!