Mine are the one-off variety printed on a high end color copier. See here and here for examples. These are NOT like the commercially printed, high grade reproductions and are a little over half as thick as those or original boxes. Each one also takes me about half an hour to construct by hand. So if you're looking to do 50 or so boxes, these will not suffice. I can barely keep up with the demand for the dozen or so Piggy and Blix box requests I have now, lol.
There are members here that have access or connections to people that could produce real, professional boxes though. I'm not sure if they would want me dropping their names here or not though. But they are some REVolutionary collectors who are very ScMART people