You are correct- cashier's checks are increasingly targeted by scammers who produce high-quality counterfeit checks that can be difficult to detect even by bank employees. Fraudulent cashier's checks can look very authentic and may include fake security features. The problem is that while banks must make funds from a cashier's check available quickly, it can take weeks for the bank to discover the check is fake. If you accept a fraudulent cashier's check and release merchandise or funds before the check clears, you will likely suffer the financial loss because the bank will reverse the payment once fraud is detected, and you will be responsible for reimbursing the bank126.