well some boxes there was 4 or 5 and some none, but my problem was with a couple teams like essendon and hawthorn about 1 in 400 packs but that would of been bad luck i think. yeah i'd say 1 per box would be about average in the end, or 1 in 20 packs.
so i think what he meant was that particular card came 1 in 320 packs
16 teams x 20 packs = 320