The same garage did exactly the same thing to my Murcielago! They crashed it, hid the fact and then resprayed it the wrong shade and oversprayed the inlet grilles. They denied the fact (saying that's how I left it with them) then ultimately owned up. Nice!
I think if an employee is going to take it on a drive and have the whole thing covered up it should come out of their pay so they can learn not to do that I doubt there would be future wrecks if that were the case.