Without strong controls over the use of cash registers, your business risks serious financial losses. Issuing fictitious refunds and falsely voiding sales are common ways employees steal money. Both involve disbursing cash without returning inventory and, thus, usually result in high inventory shrinkage. Other red flags include disparities between gross and net sales and missing void documents. To prevent register theft, provide employees with antifraud training, offer a confidential fraud hotline and regularly perform horizontal analysis of income statements.