Gina Castillo sells memberships to the Santa Fe Symphony Association in Santa Fe, New Mexico. The Symphony's procedure requires Castillo to write a patron receipt for all memberships sold. The receipt forms are renumbered. Castillo is having personal financial problems and she stole $500 received from a customer. To hide her theft, Castillo destroyed the company copy of the receipt that she gave the patron. What will alert manager Blaine McCormick that something is wrong?