Of course you must report the interest income on your return because you received the refund for the estate.
If the 1099-C is not in your name and social security number (SSN), you would not report it on your tax return. If it does have your deceased partner's name and SSN, then it's unlikely the IRS is going to come after you for it.
Since the estate is closed and there is nothing else to report on the estate after 2022 you should keep the forms with the final return. If by any chance it was due to bankruptcy, there would be nothing to report.
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