These popped up in my least favorite search engine news feed – https://www.google.com/amp/s/fortune.com/2020/04/16/coronavirus-scams-stimulus-checks-secret-service-covid-19/amp/ and
If you get a Counterfeit check or a notice letter from a bank, don’t cash the check or contact them using whatever contact information is in the letter. Keep the envelope and it together. Contact the Secret Service about them picking it up. It may take a while, but you can give key information over the phone that may help track the offenders. You could send them photos of the envelope and letter.
Also check both the IRS and Secret Service websites. I have not gotten a paper check from the IRS in a long time, but it should come in an IRS official envelope that is regular sized and not oversized.
If it’s a bank claiming to help, that’s easy to check out. They may spoof a real bank name, but use a different address and/or phone number than the real bank. Same for a fake IRS letter or check. The IRS website https://www.irs.gov/ has addresses and phone numbers for the service centers and local offices.
The scammers may have enough information about you to sound believable. It’s a lot easier to get your personal information than you may realize. It’s also fairly cheap.