We are driving from Cancale in Brittany to Bayeux on July 1st to take a private tour of the Normandy beaches. That night, we have reservations to stay in Paris. We are supposed to return our car in Bayeux by 4:30, but our tour doesn't end until 5:30 and we need to hold onto the car for the duration of the day because our group and all of our luggage doesn't fit into the car of the person conducting the private tour. Since we're not staying in Bayeux either night, there's no local place to stash our luggage so the rental car is really the only option to leave the luggage for the day.
Does anyone know what happens if you just show up to the car rental return in Bayeux after hours? Is there a drop box to leave the key? I know that the car rental place is just a small gas station/convenience store and a very small operation. We don't mind being charged extra if necessary - we would just prefer not to cut the tour short if we don't have to.