I will let Paul B tell you the story of the find.
Both Harp and Cord molds came out of Jeffersonville find.
If and when we get the rest of the O'Neil records (that are in a storage locker in Las Vegas) the STC cords might be there. We only got a small percentage of those records which are on Preserving Gaming History web site.

No clue on your small key. UFC as far as I know.