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A Wage and Income Transcript for 2019 from the IRS will list all the 1099-INT forms that were issued to you, even if they were not included in your tax return. That's where the letter from the college says they found them. If you filed a joint return, you have to get a Wage and Income Transcript for your spouse as well, in case any 1099-INT forms were issued to your spouse.
To get a transcript go to the following link on the IRS web site. You want a Wage and Income Transcript, not a Tax Return Transcript.
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