You do not have to report the interest. Confidently file your return with only the interest you actually received that belongs to you in 2023.
As you indicated by you at the beginning of the thread, you realized you had received an overpayment and returned it without cashing it. They have confirmed receipt of your correspondence. The IRS is taking extraordinary timeframes to resolve any issue since COVID. I will repeat the previous answers - you have all the documentation you need should any question arise later.
@mm1232
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