NPC's tend to have an unlimited supply of items that need to be given to other people. A different yet similar example is the Chasing A-Me 01 quest in Un'Goro:
You give A-Me 01 a mithril casing, and she becomes a functional robotic gorilla needing to be escorted out of her cave. When you fail, she respawns and when you speak to her, she is still a functionin robotic gorilla becuase you've already turned in the mithril casing.
