Cheryle,
First, you need to contact the nearest office of the US Secret Service and ask for an agent in the Financial Crimes Unit. Explain the situation to him/her and they will probably advise you on what to do. They are fully aware of these scams and are likely already investigating it. Next you can go to
routing numbers to check the routing number on the check. Don't get too comfortable if the number matches the name because some counterfeit checks do actually have the correct routing numbers. Next, you can go to
bank directory to find the name and address of the bank. Then go to the Internet and do a search on the bank name to get the phone number. Probably the best person to talk to would be the bank's security officer. Just ask for him/her and if you are asked why you want to talk to him/her just say you want to discuss a possible fraud against the bank. After all, if there are counterfeit cashier's checks floating around with their name on them, they probably know it. If they don't know it, they will probably appreciate the information from you.
Good Luck!!!!!!!!!!!