If your IRS check is lost you can initiate a trace on it. This generally results in a new refund check being issued. If the refund check was destroyed or stolen, the same process is used to authorize a new refund check.
If you’ve checked IRS tax refund status of your check and it should have arrived a long time ago, you can start a trace. This means you call the IRS and tell them you either never got the refund check or you got it and it was lost, stolen, or destroyed.
If you prefer, you can fill out IRS form 3911 instead of calling. Either way, you have to initiate the check refund trace within 17 working days of the date the IRS received your income tax return.