Simple tray with hidden compartment

I had that idea of a simple tray with a hidden compartment but I wanted to make sure it doesn't reveal itself just by lifting the tray in the wrong spot. The Inner tray hooks into the outer tray and gets locked in with a pin. It's not the most convenient thing to do but I think I would only hide things that I don't need on a day to day basis.

The hidden compartment has a height of 3mm.

If there is interest I can work on a version with magnets.

Let me know what you think and I would love to see your prints!