User blog comment:Mckrongs/Monster Hunter 4 for the Nintendo 3DS/@comment-3062343-20130913184243

I haven't read all the comments, so my apologies if this has been posted already, but apparently there's a system where you can exchange monster materials in order to obtain materials from monsters not in the game. This could mean that, for example, the Shogun helmet was made from materials obtained in this manner. So seeing materials from a monster isn't confirmation of them being in the game.