Hello WLL1,
Hope you're doing great!
So if IRS letter identified the error on your return and it has been corrected by you sending the additional amount required, you don't need to file an amended return. Just keep all the documents in one place, in case something comes up in the future and you wanted to figure out what had happened. It is good idea to keep your records for at least 3 years or more.
See this How long should I keep records?
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