I have no idea how you go about confirming item drops, but I just got a Blaze Pepper from an Ash Wolver on Floor 20.
Confirming Item Drops
Critter Carapaces drop from Bull Chromalisks.
Gun Puppy Mk IIs drop Silver Coils.
Really last test . . . in this thread.
Force Dynamo drops from Turtledrone and also got one from a box.
Got a Royal Core from the solid jelly too.
There's also >>>this thread<<< with a bunch of entries.
I've gone and added the information from this thread and some of my own information into the appropriate monster pages (I'm keeping away from the crafting page for now). The loot lists will initially look a bit messy, but hopefully as we get more information we can start generalizing (eg. when we confirm that every type of Devilite drops Brimstone, Sharp Fangs and Monster Bones). This can also help with the crafting page, where we can list monster families rather than listing every type.
Just got Grave Soil from Skeletons, the pink Kats, as well as the green ones. It seems to be a new 2 star item.
Oh yeah, it seems Sulfur was downgraded to a 1 star item from a 3 star as well, but I would prefer to not go in and change someone else's work.