Chapter 6....this is a FASCINATING chapter that Roger included; I re-read it this past weekend. It takes a snapshot as of December 31, 1933 to gauge how many of the entire production run of Saint-Gaudens Double Eagles -- just under 70,300,000 -- MAY have survived based on the KNOWN destruction quantities. Obviously, that's a ceiling and doesn't mean that all unaccounted for Saints still exist. But I think it does point to the possibility of more hordes possibly being out there or just large numbers of people holding some coins and being unaware of it. Or even technology-deficient banks or central banks having a few bags in long-forgotten vaults or holding areas.
Page 603 gives the breakdown: just under 27,000,000 Saints were melted down, leaving about 43 million potentially available.....subtracting another 3.7 million known survivors and you get just under 40 million Saints missing and/or unaccounted for.
The real fun would be if there were any hordes for the 1929-32 years. Even a few hundred or even few dozen could really cause sparks in the market.