And if you mailed anything 2018 or 2019 they weren't even opening the mail so it could not have shown up anywhere. Maybe you were looking at the Stimulus Check payment?
They just started opening the mail in June that's been stacking up. 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
