I was just reading the tutorial that I wrote before I left for work this morning (crazy!) and realized that although the measurement for the cover of the box is correct (6" X 8 1/2"), I wrote in the instructions that you need a piece of cardstock 6" X 10 1/2"...ai-yah! Sorry for the confusion. The correct measurement for the cover is 6" X 8 1/2"
FYI, the post has been corrected and I hope I didn't confuse anyone.