Double box

There are two layers inside the box.
How do you open the box inside?
Title：Double box
Craftsman：Karakuri Creation Group
More ditails of this work.↓
karakuri.gr.jp/en/products/ch-7/
What is Karakuri box?
It is wooden puzzle box that made from Karakuri Creation Group in Japan.
You have to solve the mystery if you want to open it.
You can see our various works on our website.↓
karakuri.gr.jp/en/
Web shop↓
www.karakuribox-webshop.com/l...
Instagram↓
/ karakuribox.official

[@BeeBait]

Ah! Stumped again!