After the form has been completed by an agent of the insurance company, it should be delivered back to the third (3rd) party for review. The requesting third (3rd) party must deliver the form to the driver’s insurance provider in order to obtain specific information regarding the driver’s insurance policy, such as the policy number, expiration date of insurance, and details pertaining to accident coverage. An auto insurance verification letter is a form that provides proof to any third (3rd) party (such as a rental car agency, DMV office, etc.) that a driver has auto insurance.