1099-INT Form, which copy to send to the IRS?

I amended my tax return and mailed it to the IRS. I got a letter back saying I did not submit sufficent information for my return, which I think I had forgotten to send a copy of a 1099-INT form to them (which was the reason I had to amend; I forgot to include said 1099-INT originally). I downloaded the 1099-INT form from the IRS site and I see stuff like Copy A, B, and recipient's copy. Copy A looks what appears to be for the IRS and it says I cannot use that one since it's for informational purposes only. I tried to find such a copy on the IRS website but I cannot find it. What do I do?

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What happened to your own 1099-INT that reported the information to you? Instead of a blank one from the IRS, why don't you see if you can download a copy of the one from your issuer.