Driving to work last Friday in 09mcs and heard a loud banging noise. Out of corner of eye I saw the drivers side scuttle flapping around by the blinker wiring harness and then it was gone! (scratched the hell out of my paint as well).
Dealer threw me a loaner and sent car out to body shop for the paint.
Just got it back and it's all good now I was surprised that the scuttles just snap in without screws or anything else to hold em where they belong.

 

They do just snap in and if you don't get them in just right, they fly out. I just had to replace one of mine.

I've got an extra JCW scuttle if anyone else has that issue and needs a driver's side JCW scuttle.