The Prius does not use keys. It just uses a the FOB itself. I had ir on the 21st and was not able to find it. I was going crazy as it costs about 400 to replace it and the car will not start without it. Sure miss the old car keys at this point. I took another few hours looking for it today and finally found it. It had fallen on the floor and was kicked under a stand. Just glad to have found it.