Copy of your cover letter to the Non-Custodial Parent. • Copy of your spreadsheet.Listing of all TDI forms. Fill out the application. Complete a certificate of insurance. Fill out the insurance form that matches the type of service you provide. A complete list of your property will help you decide how much coverage you need and will make filing claims easier. Update your list regularly. How to fill out the Proof of Insurance Letter Template for Policyholders? Your "Evidence of Coverage" (EOC) provides details about what the plan covers, how much you pay, how the plan works, and more.