Crock of Gold
Leprechauns are reputed to store their hoard of golden coins in a pot stored at the end of a rainbow. At their largest, leprechauns are presented as the size of a small child, although the leprechauns of Darby O’Gill and the Little People are smaller still.
As gold is heavy and the little people are tiny, how much gold do you really expect to find in their hidey hole? While gold is valuable, this doesn’t seem particularly efficient in a time-for-treasure basis. For an adventurer, beating up a kobold and rifling through it’s pocket change might be more lucrative.