One Piece Chapter 22, page 10: YOU ARE A RARE AND PRECIOUS ANIMAL TOO

Luffy and Nami sit on the beach with the chest-man, who introduces himself as Gaimon. Gaimon is surprised to meet someone who has eaten a Devil Fruit, while Luffy notes it is his first time meeting someone stuck in a treasure chest. Gaimon explains that he got stuck inside the chest and has been living alone on the island for twenty years, shocking Nami.