EXCITING opportunity for football finds. A small hoard, about what could fit into a safe-deposit box, of Topps rack packs, 15 in all: 5 from 1975 and 10 from 1976. Rack packs hang from a rack in a store, and a collector can see the first and last card in the cellophane pack. The cards in-between are a mystery. This mystery continues to this day as these intriguing rack packs have remained unopened for over 40 years. The packs each contain 42 cards, three wrapped groups of 14 each. Thus, there are 630 cards in total, but only only 90 are visible. These include: O.J. Simpson, Csonka, Griese, Dawson, Sipe, "Mean" Joe Greene, Merlin Olsen, Alzado, Branch, and Billy Kilmer, Riggins, S. Cunningham, Boozer, Tatum, Guy, and Upshaw.