The IRS sent out a lot of letters. The last couple years were a mess and the IRS got way behind processing returns.
IRS suspending notices
https://www.irs.gov/newsroom/irs-continues-work-to-help-taxpayers-suspends-mailing-of-additional-let...
See this CNN article requesting another copy
https://www.cnn.com/2022/02/11/success/irs-tax-letters-suspended/index.html
