Stacking “pineapple” box with magnetic lid. Requires the following rare earth magnets:

12x 6x3mm magnets

2x 18x2mm magnets

The hole sizes should be about right for press fitting the magnets. However YMMV, you may need some glue (unlikely) or the holes may be too small (more likely). Print just the lid and try and fit the magnets. Note the bigger magnet is a little trickier to get in but less likely to break the box so smash away.

This version has cute spikes to align the lid. I will upload a version without the spikes and also has more sizes.

f3d available on github you can download it and change the hole sizes if you like.