My wife went to the post office with her Prius a while ago and she realized that she dropped her key on the driveway when she got to her destination. Needless to say, the car would not start back up when we got there and we got stranded. Is there a way to keep some sort of a spare on the car without having it activate the doors or ignition? In all my other vehicles, I usually keep a hidden spare handy and I'm wondering if there is a way to do it with this vehicle. Thanks in advance.