If you have an amount on line 30 for the Recovery Rebate Credit (the 3rd Stimulus) and the IRS took it off they think they sent it to you. Maybe it went to an account you don't remember. Or you got a check or a card. It was probably easy to miss the debit card in the mail and think it was junk mail. They have to put a trace on it.
Double check your bank accounts and check both your IRS accounts if married to see when and how much the IRS sent you.
https://www.irs.gov/payments/your-online-account
Request a trace for a missing third Stimulus payment
https://www.irs.gov/newsroom/questions-and-answers-about-the-third-economic-impact-payment-topic-j-p...
