It is too late to file a 2020 return to get the 1st and/or 2nd checks. The deadline was May 17, 2024 to do that.
If you filed a 2020 return by mail several years ago, you needed to follow up sooner to see what happened.
See what your online account at the IRS shows.
https://www.irs.gov/payments/your-online-account
If you need to trace a payment that the IRS says has been issued to you, mail or fax a completed IRS Form 3911, Taxpayer Statement Regarding Refund.