This geocache is a bit more elaborate than normal hiding places, easy to find but hard to open.
All parts can be printed without support. I created the texture of the roof and floor using the fuzzy skin feature. For the closing mechanism that fixes the puzzle box you need 8 magnets (5x2mm) that are glued in.
The puzzle box is a remix of a remix (https://www.thingiverse.com/thing:2670062).
For customization I have also uploaded the complete model as a step, have fun
The author hasn't provided the model origin yet.