You can't contact anyone during closing hours that can readjust your time frame but they're usually understanding if you call the next day or 2
You can always drop it off at their airport location they are always open. You still might get charged for another day if you didn't let them know you will be dropping it off late at their airport location.
Your going to have to just return the car 1st thing in the morning. They open at 8:00am. They will charge you 1 more day.
Call the 800 number
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