Are you sure that this was not a CP21B? So far as I can see, an IRS CP21E is only for a balance due.
So I am concerned about a scam. It's a pretty obscure scam, but there are scams where someone sends you a check to have you cash it, then later asks you to send the money back, and after you do, they cancel the original check, so you are stuck owing the money that you never asked for.
Do you live in a location where there is a local IRS office ("Taxpayer Assistance Center") or a branch of the Taxpayer Advocate Service?
If I am right (and I hope I am not), the IRS will want to hear about this. Or, of course, if you got a CP21B, then that could be for a refund.
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