The original box was created by Sam. The box above is the one I made from her lovely directions. It takes a 12" x 12" piece of cardstock to make this in the U.S. - Sam used an A4 piece of cardstock in the U.K.
One of the members of the Pootles FB group (Nancy) edited the dimensions so we Americans can make one from an 8 1/2" x 11" piece of cardstock.
Sam's version is on the left while Nancy's version is on the right.
If you would like to make one, please go here for the YouTube video.
Have a great day!