Looting a rare should be marked by Blizzard completing a specific quest for each rare. This type of quest is just a marker quest and does not show up in a quest list. However, when using Blizzard APIs to determine if a quest is complete it will work with these marker quests. Therefore, you would want for each rare to know the associated Blizzard marker quest and use the API with that value to see whether the person has looted that rare.
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