If you've left something in your Zipcar, you can re-enter the car within three hours of the end of your reservation to retrieve the item, as long as the car hasn't been reserved by someone else. Please don't start the vehicle, or you will be charged for the use.
If it's outside the three-hour window, you should make a reservation for the next available hour to gain access to the Zipcar. If you find an item in any Zipcar, please place it in the glove compartment or boot. Hopefully the member will return for their missing item.
If you've left something in a Flex car after your trip has ended, you will need to create another reservation on the app to re-enter the vehicle and retrieve your belongings.