Tamatebako

Tamakushige "comb box" is the name that occurs in earlier precursors, such as the anecdote of Ura-no-Shimako (Urashima-no-ko) in the Fudoki of Tango Province and the Manyōshū (8th century).

[7] It is understood during the short time he spent at the Dragon Palace, many years had elapsed in the world back home.

This is what occurs in "Urashima Taro" variant collected by Keigo Seki, a telling from Nakatado District, Kagawa.

The feather from the first box then fastened itself on his back, now transforming Urashima into a crane, and the princess appeared in the guise of a turtle to see him.

[13] The legend in the Manyōshū refers also to a tamakushige (玉篋), translated "jewel-casket" by Aston, which Urashima receives from the lady or daughter of the Sea-God (Watatsumi).