I'm not sure if you can do this. I know with "regular" passes (park hoppers or PHplus), guest services can check how many of the days have been used and will deduct the cash value of the remaining days from the purchase price of a new pass; I've done this to convert PH's to "new" PH's and to an AP purchase. I'm not sure if they would do it with a FITS, since you buy them from an off-site dealer. The one time I had a problem cashing in an old pass was when I tried to do it with one purchased from the Nikki Bird hotel. Also, BIL couldn't cash in passes that were given out as a time share perk. Also, how would they determine the "value" of a FITS...Divide the purchase price by 30 or 31? My guess is that maybe, if the FITS is unused, they might let you cash in its face value (since Paramount purchases them directly from Disney), but I don't really know.