Client received following letter from IRS (portion of the letter): "Our records show we received your amended Form 1065 for the tax period listed above. We're sorry but we can't find your amended Form 1065, so we need your help to finish processing return." "Please send us a newly signed copy of your amended return for each tax period listed below". An amended return was never filed. Original 2020 Form 1065 was paper filed. Letter appears legitimate, I.E. it is not a scam letter. This could be leftover issue from Covid processing issues. Anyone see this? Any thoughts? How would you proceed? Thanks.