One Piece Chapter 22, page 18: YOU ARE A RARE AND PRECIOUS ANIMAL TOO

In the flashback, young Gaimon realizes that no one has searched the top of the tall, steep rock hill in the center of the island. He climbs up the cliff and is stunned to find five treasure chests sitting at the top. Excitedly, he turns to call out to his crew, but slips and falls off the cliff, landing directly inside an empty wooden chest below.