You're right, the actual K-1 does not have a separate area for noting any amounts from U.S. obligations. It would be included as a note at the bottom of the K-1 or attached to it.
In the absence of any note, leave the boxes blank that ask for "Interest from U.S. obligations."
As I mentioned in my original answer, interest from U.S. obligations is sometimes treated differently on the state level. That's why the boxes are included in the entry.
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