What are the different ways you can tell that a base set booster box is shadowless? I know that the charizard on the side of the box is different. Are all of them sealed with clear plastic?
I saw a base set box that included all those features you've stated (blowing fire charizard, venusaur minus the green glow in the backround, and different blastoise) BUT the box was sealed with Wizards of the coast stamped plastic. Did some of the later printings of the base set unlimited shadowless boxes have this seal just before they discontinued them?