Why do you think it was lost in the mail? Did you mail your 2019 return? When? The IRS says not to mail it again.
If you already filed a paper return, we will process it in the order we received it." So it may take longer if you mailed in June or later. So you have to keep waiting.
See this IRS page for the latest information
https://www.irs.gov/newsroom/irs-operations-during-covid-19-mission-critical-functions-continue
Is it showing up at IRS Where's my refund yet?
https://www.irs.gov/refunds/
Make sure you are using the refund amount from your actual federal tax return and not the combined amount Turbo Tax showed you at the end. That was for federal and state combined.
