I think it was pretty random. When you open the coin pack it has a ticket inside. It also looks like the tickets were made by a third party, he probably just provided them the information for winning tickets and non winning tickets.
I got lucky and won a lealana brass 0.1.
So 2 down...
(1) .25btc Lealana loaded silver bitcoin
(1) .10btc Lealana loaded silver bitcoin
(4) .10btc Lealana loaded brass bitcoin
(1) #20 (7) coin Genesis series 2 coin set (contains 1 of each of the coins within this series)
(1) free box of Genesis series 2 coins
(1) Crypto Imperator 10K Loaded Doge coin
(1) Redeemed 2012 casascius 1btc
(2) .05btc
(1) .10 btc
(1) .15btc
Is there any chance of getting 5 prizes from five consecutive scratch tickets?
He who gets will be super lucky!