The exorcism that couldn't wait
On the Perron case, Ed sets up cameras and recorders to gather evidence and ask the Church for an exorcism. The evidence is lost and approval doesn't come in time.
When Bathsheba possesses Carolyn, Ed performs the exorcism himself, even though he isn't a priest. It works, and Carolyn comes back. The house's music box goes into the artifact room with the other objects from their cases.