EVOO should be a much better bet than olives in a can. Good EVOO smells different than "regular" olive oil, and olives in a can are basically dead and don't smell of anything yummy.
There is also olio nuovo (or olio novello, depends on from which part of Italy) which is fresh unfiltered olive oil available only seasonally (around right now, for Italian olives) which is in entirely different class by taste and smell.
I thought of that, but if I was only going to get one thing, the google hits suggest that it would be much more reliable to go with olive wood, then olives themselves; most the of the hits concern constipation and things like that (only a few single out olive oil), which is inconsistent with what I would expect from a catnip substitute (firsthand, the effects of catnip, valerian, honeysuckle, and the silvervine I just got today, are all fairly noticeable) and suggests that whatever the active ingredient is (may not be the same as catnip, as some of the oli...
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