Special folded card
Found the idéa to the card on YouTube. You can find several videos that explains how to put the card together. Below you’ll find a template of it, and I’ve used TWO of those for my card!
I made a little belt to keep the card shut until someone gots it.
The middle of the card are covered with an extra piece of paper both front and back to hide the two parts.
I hope you figure out how you shall fold after the template.