We just got back from WDW this past Wednesday and I ran a little experiment while we were there. I brought our expired annual passholders cards and old
MNSSHP tickets and they worked in the fastpass lines for the rides. It is easier to use a card at the fp touchpost then a MB, especially if you are using someone else's ticket for the ride. We usually let our grandson's use our fastpasses for the rides that we don't want to go on and now I know we can just give them our expired AP card instead of a MB.