What are the most practical, effective steps to take to spot forgery involving company checks returned with company bank statement?

a. Examining each check's routing number and endorsement and verify each check's dollar amount against the check register.

b. Fan the checks looking for any with slightly different color, verify each check's dollar amount against the check register, and investigate any gap if check numbers are not consecutive check numbers.

c. Fan the checks looking for any with slightly different color and investigate checks numbers or too many checks with second endorsements.

d. Hold each check up to the light or under a magnifying glass to check each check's hologram or other special printing technique,