With the 42 pack, you’ve got a 1 - (1 - .061)^42 … 92.888 % chance of getting a Daken cover. That’s better than the 10 pack, which only has a 1 - (1 - .061)^10 … 46.7% chance of giving a Daken cover.
Here’s a million random tries at the 10 pack, with the first number being the number of Daken covers, and the second is the number of times that outcome occurred.
{{0, 533196}, {1, 346253}, {2, 101092}, {3, 17329}, {4, 1973}, {5, 149}, {6, 8}}
And a million random 42 packs. Most likely outcome is 2 Daken covers, then 3, then 1, then 4, then 0.
{{0, 71156}, {1, 193691}, {2, 258780}, {3, 223993}, {4, 142082}, {5, 69333}, {6, 28065}, {7, 9399}, {8, 2670}, {9, 670}, {10, 134}, {11, 23}, {12, 3}, {13, 1}
Shortly after I bought the game wouldn’t let me buy another one, as it said the “comic store was offline”. It didn’t had any problems letting me buy the HP though. So, like 15 min later the comic store “opened” and I managed to get a Daken on a new pack. So I think it was something BEFORE the closure.
If you already have 1 of each cover you can buy 1 cover for 1,250. You can get 3x covers for 3,750. You can buy 6 for 7,500. He got 3 for 7600. That is not lucky at all.