WTF is an expired FP? How do you know it is expired? Usually, they consider FPs are valid for certain period of time (15 months or something like that). But there is no hard and fast rule about.. if they expire on this or that day. Could you please try to provide your source, if you found out somehow that your FP's are expired. General way of USCIS's operation is that they make sure that a case before being approved had the FP's done....preferably fairly recent. If they think the FP's are unacceptably ancient (This again is subjective. Depends on IO) then they might request another round of FP's before approval. This has been my observation.