Trick question.  What do you mean by "supermajority matured but not redeemed"?  They were hold past their final maturity date, when they stopped earning interest?  Then the interest income is taxed that year, anyway.  

We really don't talk about those people with bonds that reached final maturity in 2011 but did nothing with them and then died in 2021.  Let your conscience be your guide.   For those who believe we have a tax on pieces of paper, not on income, the 1099-INT is easy to accept as proof.