The Workshop Elves and the Missing Baubles

The job of the workshop elves in this story is to get all of the decorations ready in time for Christmas.
Every night, when the elves leave the workshop, the baubles magically come to life. When the elves return the next morning the baubles are missing, but there are always clues left behind.
What the elves don't know is that when they are away the baubles will play!