That's an interesting question! Elf on the Shelf is a fun holiday tradition where children get a special elf that they name and keep in their home to watch over them. The elf's job is to make sure the child is being good, and they move around the house to keep a watchful eye on the child's behavior. However, it's possible that the elf may not have moved if the child has been good! If the child has been on their best behavior, then the elf may not have anything to report back to Santa and may not move around as much.