Secret Drawer Box
A box with a secret drawer in the bottom. I think Alex would really like this.
V1
The underside of the box will have a skirt, the two sides of the skirt can slide. When they are in place, they prevent the end skirt from depressing. Slide them back, depress the end and it pushes a hidden spring allowing the drawer to slide out (pushed by a spring).
V2
The drawer slide is held in place by magnets, ~4. Their poles are aligned with magnets hidden in the lid. To open the box, remove the lid, set the box on top (correctly aligned). I expect the magnets will still bind, so you'd have to push the drawer in, but then it should pop out.