Do you know that it was truly lost? Have you checked the IRS site to be sure that the refund was issued?
You need your filing status, your Social Security number and the exact amount (line 20a of your Form 1040) of your federal refund to track your Federal refund:
https://www.irs.gov/refunds
https://ttlc.intuit.com/questions/2557401-how-do-i-replace-a-lost-or-damaged-tax-refund-check
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**