If you efile you don't have to send the IRS anything. If you mail your return you can make a copy of the 1099-Int to attach . Or maybe print out another one from the bank's website.
The bank doesn't have to send a 1099-Int for less than $10 but you still have to report all your income. But since they took out withholding they sent you a 1099Int. You can make a photocopy of it.
