Are you referring to Treasury notes/bills that were all bought and redeemed in the primary market, or did you happen to buy and sell US Treasury bills/notes in the secondary market as well? If the latter, did you get a 1099-B or a "composite 1099" from a broker/institution that has 1099-B info on it?
If you had secondary market transactions, I'm a fellow user, not a tax expert, but I suspect TurboTax Expert @CesarJ will be able to address that situation.
