They DO appear in Special Items. And they don't vanish on their own; you have to manually drop them or use them up in a recipe.
i'm pretty sure i know what i can see in my inventory, and i know i can't see all of them. about the dissapearing, i'm not so sure anymore
Do a search; hit "Ctrl + F" or whatever combination your computer uses. If it is not there (and you spelled it right), then you don't have it.
Maler, the item in your Special Items usually get listed by world. Kinda like this... -World Adventure drops -boss drop -next world Adv. drops -next world boss drops After that, I think, it goes like this -Challenge drops -Phoenix drops -more challenge drops -Nidhogg drops -FP purchase items -Gifts I'm basing this on my own Special Items menu, so if it differs from anyone else's, then please add upon this guys. Maler, I hope this was helpful
I find that i can only see all of what i have if i go to my profile page and view my inventory at the bottom of it