Letter 6575 is ONLY for the 3rd EIP payment. Better check your bank records for a deposit(s) of $1400 per person sometime after mid-March last year. The IRS says they sent you the $1400 each so if you say on your tax return that you did not receive it, your refund will be delayed for a long time. if you really did not receive the 3rd stimulus amount then you need to have them trace it.
LOST THIRD STIMULUS CHECK
https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-j-p...
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