6 cases and no Grim fur!!! You know, these may be inserted properly, but say the feather is 1 in 4 cases, and you get 5 cases, you might not get one at all. But someone who orders 3 cases, might get three. It is really luck of the draw of the cases that you actually get. I could be wrong though.
Definately luck of the draw to an extent but of all the cases that have been opened by members I would guess we are well below 50% of the cases containing any creature cards

Surely over the total # opened by members coming from many different sources you would figure it would average out.