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Here is the template I made showing the size and score measurements. The blue lines on the template are cut lines. The red dots indicate the pieces of the template that you will cut off and discard. I used a corner rounder punch for the top flap piece and I also cut the side flaps at the top of the box in half (as shown on the open orange box).
This is what your box should look like before assembly.
First, the 3/4-inch flap on the side is adhered to the opposite side. I use a tape runner. I find it is easier to line up the flap to the side. Next, the bottom flaps are tucked in and the last one glued down. BAM! You have a box to embellish and fill with treats. Let me know if you have any questions.
Two other Halloween projects from last year are here and here.
Enjoy, and have a safe Halloween!