Closed India Regular Account Interest Payment entry with no account id and interest payment and only final payment information.

I closed India Regular Account last year in January 2025 and received the final check which I deposited into my NRO account. I do not have any records with account number and interest received in 2025 before closing the account. I only have the final check amount received.  I reached out to the bank for help to find the account number and interest received in February 2026. I was informed that they cannot provide the information per the new RBI guidelines for closed accounts. How do I enter this data into 1040 and also FBAR? Please advise.