Redfield hoard, about 300 bags, the Continental bank hoard, 1500 bags. I'm sure there are others (not including the GSA hoard almost 3000 bags). By their very nature you don't normally know about hoards until after they have been disbursed. So if there are still hoards out there we would NOT know about them. During that two year period in 62 to 64 the Treasury disbursed literally tens of thousands of bags. It would not surprise me if a fair number are still around (During the 1980 silver melt I know of one dealer who sent 300 1883-O bags to the smelter. These may have come from the Continental bank hoard though since he was involved with its disbursal.) And when they were distributed many were checked for rare dates, but not high grades because at the time if it was a common date it might have been worth $1.50 to $2. If it was REALLY REALLY nice you might get $5, but it wouldn't be easy.
What's sad is that the tragedy of the Great Morgan Melts didn't even teach the coin hobby a lesson... halves, quarters and dimes are still being melted en masse.
The Great Falls Collection was not from bags. The owner was a collector who had a source who was able to cherrypick nice Morgans for his collection. Comparatively speaking, the Great Falls collection was rather small. Here is a link to the collection auction records on Heritage. Great Falls Collection I own 10+ examples from this collection and many are the finest toned Morgans I have ever seen.