If you choose a Valet Parking service you will be required to leave your car keys with the parking attendant. This parking attendant needs your keys in order to park your car for one once you meet them at the departure hall. They will also need them to drive your car to meet you at the arrival hall when you arrive back from your travels. You can be assured that for your trip your keys will be kept safe and secure and your car will not be moved/driven unless absolutely necessary.