After you cut and score the cardstock, you trim away the outside corner pieces to form the box shape (with a flap). I used a circle punch crescent on the inside portion - so you can see the chocolate and have an easier time grabbing it to get it out.
The images in the above photo come from the set Say it with Scallops. This set is special because it's the annual Ronald McDonald House set. $2 from the purchase of each set goes to support the RMD house charity. There are 4 images in the set that all coordinate with our scallop square punch - too cute.
Here are more little chocolate boxes:
And here's one that I modified to hold 3 pieces of chocolate. I thought these would make a fun treat for Emma's teachers, and they deserve more than one piece of chocolate for sure!