I recommend that everyone leave your car at the dealer. If you have to get into 'Lemon Laws' time at dealer is the major criteria. Put the miles on their loaner car, that's what I am doing.
EDIT: Just got off the phone with dealer and Clayton (Scion Case Manager).
They both tell me the piece of metal came from the aluminum cover during the removal process. I expressed my concern that it was damaged during removal, will need to be replaced and why was it damaged? Was it due to toyota tech working on suby engine? I'm feeling worse and worse about my car. I hope my faith can be restored. Despite that they tell me the car will be ready tomorrow. Only 1 week after getting parts. That's confidence inspiring

Chris