You still need to ensure the policy is for a SFHA. He could have had a policy for a B zone which is not considered a SFHA. The notice that they are in a SFHA and that flood insurance is required, despite them having the prior policy, should still be provided. That is simply a due diligence process you should have consistent in your processes and procedures for MIRE, regardless if they had it prior to you requiring it.
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Be stronger than your doubt, be braver than your fear, be bigger than your anger.
-Kino MacGregor