Employers are typically required to obtain proof of eligibility to work in the U.S. in completing an I-9 form for the employee. That could have aided you in obtaining such information or deciding to terminate the employee if they could not produce legitimate documentation.
Given that you do not have that information, you can still sue in small claims court for amounts he may have embezzled from your business if you are a sole proprietor. If the company is incorporated, then you must normally retain an attorney and file suit in Superior Court.
I would begin though by filing a police report with regard to the employee's activities since it appear he violated multiple criminal laws as well. A criminal conviction could aid you in proving your civil case as well.
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