I was having trouble finding simple a card storage box, for cards in hard top load protectors, So I designed this simple box, its a chunky box, but that is because it has inset holes in the top of the box and lid for magnets size 8mmx2mm but it is tight to get them into place, I just increase the size by 5% in my slicer and glue them in place, works great for me.

link to the magnets I use https://a.co/d/7pUno2r