At the local cinema, you notice that there is a box office at the entrance where the cashier receives cash from customers and, with a press of a button, a machine ejects serially numbered tickets. To enter the movie theatre, a customer must present his or her ticket to the door attendant. The attendant tears the ticket in half and returns the stub to the customer. The other half of the ticket is dropped into a locked box.

Required

Identify and explain two internal control principles that you feel are present in this scenario.