He filed the Form 709 originally BEFORE that deadline and should have the receipt from the mailing service that proves it was filed before 4-15-2024 if there are any issues regarding the date he sent it in. Make sure he hangs on to that receipt from the mailing service. Since the only way to file a Form 709 is by mail, if he decides to re-send it, he could include a copy of the mail service receipt that shows it was filed on 4-6-2024.
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