2021 Panini Prizm Football Mega Box - 40 Trading Cards - 1 Memorabilia Card Per Box. This factory sealed Prizm football mega box contains 10 packs, 4 cards per pack, 40 cards total. Look for 1 Memorabilia Card per Box, on Average. Find 3 Silver Prizm and 2 Mega Box Exclusive Rookie Neon Green Pulsar Prizms per Box, on Average. Collect the entire massive 440-Card Set containing 330 Base Cards and 110 Rookies.