This is an iris box that you can open and close with the tab. Use tape to stick the tiny round cylinders to the iris flap. You also need glue to stick the pieces together. The blowout model is in the images. Please refer to this

 video to get an idea of how the flaps are meant to align and how my model works. Use glue (gorilla glue, not a glue stick if possible) and it can be helpful to use a toothpick as using to much glue can cause the mechanism to stick together. Please remember to exercise the mechanism WHILE THE GLUE IS DRYING to ensure that the glue does not break the mechanism.