Maybe if you looked up "key" and "Brady case" as search terms, you might find someone with blanks. My Rigby case comes with 2 thoughtfully tied to a piece of cord. Originally owned by a medical doctor, perhaps a careful one! They don't look too difficult to cut. In fact, a file would probably do it. H&H cases were a little more elaborate than most. Why not ask H&H in London if they have key-blanks? I found the guys there very obliging.