If you have ever tried to find them on line, it is not easy, and I think expensive if you need more than a few. Then shipping and handling. Thump.
I am CHEEP, I know it. Here is how I solved the box problem, in pictures.
Tools I use: Paper cutter, (you can use scissors, ouch) paper cutter is much easier.
Stapler, I use the plier’s type but any sturdy type will work.
A slightly heavier type of scissors.
Pencil, ruler, stuff like that.
And those useless, shirt, sweater, holiday (did I do