1099-int Treasury

I have an 1099-INT from the US Treasury for interest on T-bills.  The file they provide online to view shows everything in a list form, not with boxes.  There is a total for Ref. Box 3, but nothing says anything about box 1.  If the interest on T-bills, box 3 was let's say $1,000, then wouldn't that mean I need to also state $1,000 for interest income box 1?  I understand that box 3 is state tax exempt but that overall, the $1,000 is federal taxable.  But I didn't see how that changed my federal tax owed.  Am I missing anything?