On what basis did they accuse you of trying to steal luggage? I would not have taken that very well in the first place and definitely would have raised a stink when they finally found the luggage and dropped it off to me. Definitely something that you need to pursue and talk directly to the manager about. I didnt even know Marriott had a digital key system. I used the Hilton one and always worked well, I just dont trust Marriott tech enough to use it with them though. They cant seem ever get anything to work.