I'm my guild's forester and I have artisan up to 100 and have yet to find anything after cutting down several hundred trees.
Today, whilst I was cutting away a batch of oaks, I got the following message:
"You focus your eyes on the roots - it seems as though you can see something unusual among them. You were right! With a cry of joy, you pocket your extileent find!"
Typos not withstanding, I received no system message of any item being added to my inventory, and upon checking my inventory, I was not able to see anything new.
Is this working as intended, or is it currently broken?