Well, the worst case scenario happened to me. They did mail my ameneded return refund check on 9/21/20, unfortunately I was having my mail forwarded to a summer address then and they won't forward checks...so they returned it to the IRS. After spending 3 hours on the phone with the IRS on 10/2/20 they finally agreed that they had received it as "returned, not deliverable". So they are reissuing the check and said I should receive it in 4-6 weeks (so early Nov). Back to the waiting game. But some good news....this year the IRS is paying interest on their tardy refunds, so based on the amount they told me over the phone it appears they are paying me interest on the refund all the way back to 4/2018 (the filing date for the original 2017 return I was amending).
