So I have "kinda" tracked down another Crooked Star owner, but I’m counting it.
I found out a player named Dan Phelps had owned one of the Rosewood B/S Euphonons. I contacted Dan and he told me he had recently sold it to a friend (Dan loved the CS but is now sticking with small body guitars).
So the registry as of today is:
Senorita (14 Fret)-bayoubengal
Prairie State Jumbo-bayoubengal
Euphonon Mahogany B/S-bayoubengal
0-18-Ledgerock
0-18-Kris Truelson
Euphonon Rosewood B/S-Friend of Dan Phelps
Six down, eight to go.