User blog comment:Kaido King of the Beasts/Chapter 818: Stepping Stones to One Piece/@comment-910220-20160303173010/@comment-24850639-20160303184016

I doubt it too, but I can't give any solid reasoning. At the very least I expect the last one to be in a place of historical significance, that will probably entail its own arc. They can't just nonchalantly find it lol. The reason it's "lost" is probably pretty deep too, maybe its up there on the moon with Enel and gang.