A message in a bottle can occasionally be found within the Spirit Realm of Aminishi, requiring partial completion of the Spiritual Enlightenment miniquest, and spirit dragon charms for accessing the Spirit Realm. The bottle can be located on the western beach, below where the Aminishi moai resides before being transplanted during the Head of the Family miniquest. It can be investigated to receive a treasure map.
This message in a bottle is currently visible. (wrong?) Once a message in a bottle is found and when a player has walked near its spawn location when it was visible it will always be visible, unless the message in the bottle or its treasure map is in the player's bank or inventory.