Chess Box, by Benno de Grote (Discontinued)

Chess Box is a puzzle designed and created by Benno de Grote, who is the copyright owner. Produced in a limited number of copies, it is now discontinued and no longer available. 
This is a 3D-printed copy made under license, created with four different versions of PLA Wood: Walnut, Maple, Cherry, Rosewood, and robust PETG for the internal mechanisms. 
To solve the puzzle, you must open it and find the King and the Queen hidden inside. To avoid spoilers, I will not include photos of the open puzzle.

This is the original page on Benno's website dedicated to Chess Box. WARNING: The solution is at the bottom of the page!

https://www.bennoboxes.com/product/the-chess-box/

Dimensions: 132 x 132 x 73 mm.

I ship from Italy all over the World. You will choose the courier / shipping methods and you are responsible for custom duties. For any questions and to allow me to check the shipping costs for you, please ask before bidding.