I re-sent my 2019 taxes with "COPY" written at the top of every page and a letter explaining what happened and included the record locator from TurboTax. Separately I sent my 2020 on paper. I sent both by registered mail.
Incidentally, My husband just received his third stimulus payment, oddly enough to a investment account we have never given to the IRS, I did not receive mine (we filed jointly). I checked our IRS records and there is no update. His stimulus lookup said it was deposited, mine says there is no information.
