I received the IRS EIP 3rd payment via paper check, but lost it. How does one have check re-issued? Not seeing scenario here on the IRS FAQ site
I found a link on the IRS web site that answers your question (webpage states it is for the first payment, but it should still apply) - IRS Newsroom
you may need to request a payment trace so the IRS can determine if your payment was cashed
If the check was never cashed, they will "credit your account" but will not issue another check.
Hope this helps. Good luck!