No. That is a puzzler as in all my years have not seen any other instances of FM dies getting outside of that mint. Again, not first hand, but the probably secondary source (LH) somehow got hold of these as well as the US Mint sourced dies - I may have said that I know of the whereabouts of some FM and US mint dies. Much obviously is speculative given that the key protagonists have passed away - the collector Richard Stuart and dealer LH. Because of the intrigue, I want to query my friend again about some more information. I don't think LH's widow would be forthcoming, but I may see if I might ask some innocent questions (if possible!).
I want to find someone in the area with XRF to test the possible residual metal in the referred 1/4 Balboa US mint dies as if there is trace gold that would tend to be a "smoking gun". That still does not answer as to how in the world the FM dies were obtained. In any case, certainly a bit of intrigue....