I know this is way old, but I just returned a movie after the max rental period and thought my experience could possibly help others in the same boat. I did not realize already asked been charged, though. After I returned it then realized this, I called Redbox. They said because it was my first time doing this they could give me $15 back (roughly half the amount I paid because it was blu-ray. It sounded like even if I had done it prior they would have given me some kind of refund, just a lesser amount.