Seems like the PSNI raided several private homes in the follow-up to the bank heist, all of which were residences of noted nationalists or suspected sympathisers, and came up empty handed, at least as far as the bank issues was concerned. My suspicion is that they merely used the bank heist as an excuse for another of their massive invasions of privacy. Later, I recall reading that actual traceable bank notes from the heist were found in two places: one was a barn in County Cork, and the other was a Policeman's (sorry, P-person's) club in NI. Police, not suprisingly, called the later find a "plant," while I don't recall any such comment about the Cork find. For a useful paradigm, interested folks might want to google the Castlereagh incident of a couple years ago. The IRA remain a useful "Boogey man" for British and NI officialdom - but that's an old, old story.