They are very nice but useless — therefore, you do not throw them into garbage.
Here's a simple solution to use them.
Step 1: Sure You Have Many Cognac Boxes in Your Cellar
Step 2: Drawing Cut Lines
Step 3: Fix Your Box
Fix your box and start to saw
Step 4: Saw, Saw, Saw...
Step 5: Result - You Have Two Shelfs From One Box
Need to be sanded a bit. You may use it in a kitchen for spice boxes etc.
Good luck! More boxes — more shelfs!