Shenstone, from Ultima V: Lazarus
Shenstone himself had little to say in Ultima V. However, after the Avatar continually gave coins to Delwyn, the beggar hinted that Shenstone was up to something near noon. Watching him at that time, the Avatar saw Shenstone left the Armory at noon and buried something at the base of a tree at the northwest corner of town. Searching the area after Shenstone had left, the Avatar obtained the extremely useful skull keys which were essential for accessing magically locked rooms.
Shenstone never noticed the theft, always hiding new keys in the tree each day.