Tigers had been a valued animal from ancient times because their skin was good for a rug and their bones were used as natural medicine. Furthermore, since they do not inhabit in Japan, they were highly prized for their rareness, and the unifier Hideyoshi requested his warriors in Korea to send tiger’s flesh, bones or internal organs for his health.
The note on the box tells “fang each of a big and a small tiger”. They have been handed down from the tigers killed by Muneshige’s vassal, Shigehisa. From the mark being shaved, they might have been used for medicine.