An anecdote that probably tells you nothing you don't already know. My father has a chess set whose pieces are made of olive-wood and rosewood, and at least one cat my parents have owned has responded to the box (which I think is olive-wood, but I'm not certain) in the same sort of way as many cats respond to catnip. Googling suggests that other people have found that olive wood provokes a reaction from their cats. So you might consider adding olive wood to your battery of cat-tests.
It's worth testing if I can get a decently odorous chunk of olive wood. Not sure where, though, as it seems like the sort of thing usually sold in a manufactured form and I'd rather not pay for expensive end-consumer cutting boards or chess sets. There's also a lot of anecdotes that it works with plain old olives like, presumably, the ones you get in a can. Maybe that would work?
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