Airtag addon for pop-up wallet

I used a little piece of foam to make the AirTag fit nicely and super tight to the upper body, but it also works without it. The model itself fits perfectly inside the hole and doesn't need any glue, but if you want to be 1000% sure, then just put some glue dots on the corners :) The general shape is based on: https://www.thingiverse.com/thing:5203645