Yes, file the return and issue the K-1s to the beneficiaries. A return is required when the taxable income received exceeds $600. Likewise you would need to file to show the cost basis of the bonds because the IRS only has the redemption/sales amount. The filing requirement does not take into account the net results of the sale.
If this is the final return you should mark it as such and this will be the last one you need to file.
@jhouse78
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