How to keep the lid closed on a sliding lid boxes ??

[Charles Lent]

A pair of rare earth magnets, rather than one and a piece of steel, will give you almost 2X the holding force. You could also make the end of the box thicker to provide room at it's top for a larger diameter magnet. Unless the top is completely removed, no one will even notice the thickness of the box end. Then a magnet in the under side of both ends of the lid would not only hold the lid closed, but stop it before it pulled all the way out of the box.

Charley