Have a Tax Question? Ask a Tax Expert
Generally, you can file an online claim for a replacement check if it's been more than 28 days from the date that we mailed your refund.
See more information in this article - http://www.irs.gov/newsroom/article/0,,id=137033,00.html
Use IRS form 3911 - http://www.irs.gov/pub/irs-pdf/f3911.pdf - to request a replacement check.
Let me know if you need any help.