Magic box, can only be opened when the box is held upside down. Only then are the pins released. The lid and the bottom must slide sideways to open and cannot simply be pushed aside. The text on the printed box is in Swedish, but I’ve written it in English in the uploaded version. The text is recessed by just 0.1 mm, so if you don’t want to fill it in, you can print it as is, and it won’t be visible. Feel free to use any colors you think work well.