Do you carry the plastic valet/spare key in your wallet ? I leave mine at home and when I need to use valet parking (I would normally park the car myself in a safe spot) I just give the master key to the attendant and ask him to set the alarm after parking it. Whether he sets the alarm or not, I'm not sure all does that. I checked one time after the attendant parked my car, I walked over and saw the clown nose blinking. Not sure if all valet does it though.