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 please ask before bidding.
After purchasing, please provide your full address, including your mobile phone number and email address, as the courier requires it. I'll find the best shipping prices for you and then list them to you so you can choose.