The only show cards that i do not think should be added are the cards like a 1997 pacific with a 1999 show embossing/logo. the 1998 with a 1998 embossing/logo are fine. i have seen 100's of these 1997 cards with even a 2001 show stamp. the show should be The National, Fanfest, or an all star game show where most of the big card manufactures were promoters. I have see some 1/1 cards for a joe blow show foil 1/1. JUNK. Does the new Leaf ring a bell? I just added this ad from the 98 national. You had to by packs or boxe's to get you card embosed, of a foil stamp. this is what i am talking about.
http://www.juangone.com/pictures.php?cardid=1315. very cool item by the way, if i do say so myself.