[header] How to create a secret box [title] Choose a cardboard box with a lid. [step] 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. 
[title] Cut a piece of sturdy cardboard for the base. [step] From a separate sturdy cardboard box, cut out a square or rectangle to act as your false bottom for your secret box.