(Learning Objective 2: Applying internal controls over cash receipts) Greta Cassidy sells memberships to the Phoenix Symphony Association in Vienna, Austria. The Symphony’s procedure requires Cassidy to write a patron receipt for all memberships sold. The receipt forms are prenumbered. Cassidy is having personal fi nancial problems and she stole $400 received from a customer. To hide her theft, Cassidy destroyed the company copy of the receipt that she gave the patron. What will alert manager Stephanie Stevens that something is wrong?