I believe the "Ring Box of Curan" is missing some of these characters' ring or are misplaced in another box.
I have not seen Folcore rings drop in over 500 boxes
Folcore Stance
Calyspo
Bolero
Ranchera
Cancion
Climax
Innocentio Stance
Exclusion
Satisfy
Restore
Redemption
Mass Ressurection
Ancient Tactics Stance
I have not seen Folcore rings drop in over 500 boxes
Folcore Stance
Calyspo
Bolero
Ranchera
Cancion
Climax
Innocentio Stance
Exclusion
Satisfy
Restore
Redemption
Mass Ressurection
Ancient Tactics Stance