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How to create a secret box
Choose a cardboard box with a lid.
Any cardboard box with a lid should work for this project. A shoebox would be the most ideal choice, yet if you want your box to be significantly different in size than a shoebox, feel free to use whatever you can find.
Cut a piece of sturdy cardboard for the base. From a separate sturdy cardboard box, cut out a square or rectangle to act as your false bottom for your secret box.