The first out of three is inside the Unagi. You have to enter through the Unagi’s mouth.
Coords: x: 14067 z: 13529 y: 80
The tea leaf is located inside the Unagi’s stomach.
Second one is underneath the Kyoshi statue.
Coords: x: 14246 z: 13515 y: 77
The final one is located in a house near the edge of the island.
Coords: x: 14308 z: 13593 y: 86