If you lost your IRS refund check, you should initiate a refund trace:
Use Where's My Refund, call us at 800-829-1954 and use the automated system, or speak with an agent by calling 800-829-1040 (see telephone assistance for hours of operation).
- However, if you filed a married filing jointly return, you can’t initiate a trace using the automated systems. Download and complete the Form 3911, Taxpayer Statement Regarding Refund or the IRS can send you a Form 3911 to get the replacement process started.
If the check wasn't cashed, you'll receive a replacement check once the original check is canceled.
irs.gov
If this is for state refund check you need to contact your state.
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