You definitely need to amend the returns for the years that you left off this interest.
And you need to file the FBARs if you are required to. Here is a link to the IRS website, which indicates that you may not be penalized if you reported all your taxable income and you haven't already been contacted by the IRS about the delinquent FBARS. https://www.irs.gov/Individuals/International-Taxpayers/Delinquent-FBAR-Submission-Procedures
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