Mr. I. M. Bezzle works in the purchasing department for

Mr. I. M. Bezzle works in the purchasing department for Big Time Inc. During the 12 years that he has worked there, he has been a trusted employee and has sole responsibility for the company’s purchasing function. He started working for the company in 1990 for $30,000 a year and now makes $100,000 a year.
Fellow employees and friends have noticed that his lifestyle has improved substantially since his recent promotion to purchasing manager. Based on an anonymous tip, the CEO asks you to look into the situation. What steps would you take to investigate the possibility of fraud here?