User blog comment:IamJakuhoRaikoben/Chapter 412: Dance Unto Ishgar, Review./@comment-77.194.131.48-20141208152418/@comment-9595671-20141208152656

Considering the rarity of those keys and the amount of Celestial Wizards left is 2 (in the manga) or 3 (in the anime since that was stated to be what Hisui uses) I can't tell if that's logical or doesn't make sense.

Especially since we don't know if anyone else would find them or if the Celestial Spirit King would allow such an act.