Step 4: Fold up the box and create another crease.

Fold up the the newly created flaps.  This will expose the inside of the box.  Using the folded up flaps as a guide, create another crease on the inside of the box with the closed scissors.
Very smart and useful. :D
I do this all the time, and it works great! It definitely helps to have a game plan before you start creasing and cutting (so I've learned).

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