What reasonable steps could Auto-Owners have taken to prevent such internal fraud?

Kenneth Wulf worked in the claims department of Auto- Owners Insurance Company for ten years. When the department received checks, a staff member would note them in the file and send them on to headquarters. Wulf opened a checking account at Bank One in the name of “Auto- Owners, Kenneth B. Wulf.” Over a period of eight years, he deposited $546,000 worth of checks that he had stolen from Auto-Owners and endorsed with a stamp that read “Auto-Owners Insurance Deposit Only.”