Here is a list of all resources that to the best of my knowledge don't seem to be dropping. Please if something is wrong or missing add to the list or give its drop location and what dropped it. There are also a few at the end that drop but from a mob that just seems incorrect. If it says any after an item that means soul, essence and anima

Bodyslot: Generative malignacy, Focus malignancy(Focus malignancy drops as lesser focus malignancy so this my just be a naming issue)
Tiger eye chip or stone supposed to be in Exarchyon but isn't in game currently
Lessor Dodo any- though dodo anima with no minor,major designation does drop but there doesn't seem to be a recipe that uses it, this is a naming error
Greater Dodo any
Major Dodo anima
Rare Dodo Anima
Magnus Dodo soul, essence 
Greater Panther anima, soul
Rare Panther Anima, Essence
Common Hyena Essence, Soul
Major Hyena Anima, essence
Magnus Hyena anima, soul
Ancestrial Hyena Essence
Resistant Hyena pelt
Greater Raptor any
Magnus raptor any
Common Urgurut Essence
Minor Ousted essence
Greater Glaive essence
Elder Arionite, anima, soul
Minor Beserker essence, soul
Harden urvhail bone joint
Vial of lessor vhelger blood
Vial of ancestrial demonic blood
Silver lessors reinforcement
Jute grip cover
Pristine Bathander hide
large bone ring
Pure forged blade
Primitive iguana lether cord
Resistant ridged rawhide


I'm sure there are more but these are what I could find from Recipies that are in the traders or that i have had.
There may be items listed that do drop listed here that i just couldn't find. Please add to the list or tell us if you have found anything I listed.

There are a few items that drop from mobs that just seem wrong like Thin bone joint a level 5 resource is dropping from level 50 raptors in stondeep and desolate and Wilfred drops level 25 resistant boar bone shards. 
Hope this helps