The Collector trait helps sims find two collectibles in one spot (Solved).

Well, I am generally a rotational player so I will try to keep track myself and see which sims can do what. My Forgotten Frog sim is not a geek but has the creator trait. I will pay attention and see how she does. It may be that having both ups your chances of getting two items. The sim that has both always gets two of everything except when getting stuff via fishing.