Kyo-yaki Murata Kamesui 3-Tiered Jubako Box Set, Gourd Shape, 5 Pieces

Kyo-yaki Murata Kamesui 3-Tiered Jubako, Gourd Shape, Set of 5

Are these vessels intended for use as a 3-tier bento box?
We apologize.
We are not entirely sure.
Please refer to the images to make your own judgment.

Height: 18cm (including lid)
Bottom tier: Height 7cm, Diameter 12cm
Middle tier: Height 3.7cm, Diameter 9.5cm
Top tier: Height 3.7cm, Diameter 7.5cm

Each piece is numbered on the bottom, but one set is incomplete.
Also, one of the lids has a small chip.
Please refer to the images.