Where was it parked ? It's a bummer dude. I've been using our other car, a battered older yaris for the last 6 weeks and it's been so refreshing/relaxing not having to worry/plan where it'll be left, parking space strategy etc. You just can't trust most motorists in car parks. And it is very cowardly not to leave a note.
On the plus side your car is very shiney, that's a hell of a good reflection !