Step By Step Process:
A) Take your box with a tape ruler and marker and measure in 2″ from the side of the box marking multiple points with your marker. When your done you will see your border, connect the points using your straight edge to where you should have a nice looking square/rectangle in the middle of the box with a 2″ border around it. Leave the top and bottom of the box alone as you will not need to mark it
B) Cut out the boxes you’ve drawn. Repeat that to the sides of the box where you have drawn the boxes. When you’re done, cut off the top of the box or remove the flaps on the top of the box. LEAVE THE BOTTOM INTACT!