Signing: Box in Baby Sign Language is very similar to blocks, just a little larger. You take you hands open about 20 inches apart, and outline the sides of a box, first the left and right, then the front and back, then the top and bottom.
Usage: Boxes seem to hold a special allure for children. As well as teaching your child the basic box sign, you can further challenge them to open and close the box. Or you can ask them to put something in the box or take something out of the box.
Flash Card: Click the link to view the Box Baby Sign Language Flash Card. The flash cards are printable and available in both U.S. Letter and A4 sizes.