Bonethunder Staff Quest working on teal/blue?

[Grimmway]

So, I've done the following 3 times:

Got Regurgitonic
Had Identify cast on me to validate that it was: "Item Lore: Regurgitonic" and not the "Item Lore: Bad Regurgitonic"
Returned to Surefall Glade, waited until 3AM when Mammoth spawns.
Cast Calm on Mammoth, swim over, trade him Regurgitonic.
Receive nothing.

What am I missing? Is the Bayle List a quest item that's guaranteed 100%? Does it only work a smaller percentage of the time?

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Thanks for the responses.