Don't do it. Tell your employer that you will not be a party to the crime he has in mind. I, too, was once directed by a lawyer to do something illegal - insurance fraud. I didn't know that he was lying to me and called the insurance company to file his claim for stolen merchandise, worth many thousands of dollars. I later found a receipt on his desk - he sold the equipment. I confronted him. He grabbed the receipt from me and crumpled it. Another employee overheard us and confronted him - she knew it was a fraud - he had asked her first to file a claim and she refused. She was aware of his numerous frauds but she was desperate to keep the job. I called the insurance company and told them that the equipment was sold - there would be no claim. Neither of us were fired but he went on working his next fraud, involving both of us. I confronted him again. He said everybody does it - it doesn't have to be true. I promptly went looking for another job. Years later, he was in prison for 13 years, for fraud. When he got out, he left the state. Maintain your own integrity.
Certified Paralegal, with 25+ years' experience.