I made a box for my son’s large Magic The Gathering card collection.
You can lock it if you want.
I designed it to be completely glueless. So the whole box assembles, and holds together without needing glue.
There are clips on the bottom that fit into slots and holds everything in place. It feels really solid despite not being glued in place.
I made a smaller version for my other son (with only 4 instead of 6 rows of cards). But he took it with him to school this morning, so I can’t take a picture.