Timothy - Query FIlespace won't give you an indication of completeness, for your determination of which instances are unuseful. Best to use Query OCCupancy in conjunction with success indications in the Activity Log. Be prepared for an arduously long DELete FIlespace for those you dispose of, with much Recovery Log space being consumed. For thoroughness, you could try an EXPort Node Preview=Yes on the destination server, to correlate what it has with what you sent.
Richard Sims