I mailed mine too in April 2020. I filed mine myself, so I only had to pay $4 to send it to them. But I got no reply at all. After some money he I guess in October, I saw that we could file 1040x electronically, I did using turbo tax and it was accepted. Then I checked the status of my Mail, it said they’re not processing paper mails, so I guess that’s why mine wasn’t checked at that time. Even as my 1040x has been accepted, I still haven’t received my first or second stimulus check. I read it on the irs site yesterday that you can file for a rebate refund (if you didn’t receive the full check amount or if you didn’t receive anything at all, if you’re eligible? on your 1040 2020, or 1040sr. So I’ll do that while I file my taxes this year.
