When you file this year, the IRS (or state...if you are filing the same state) will see the excess in their records and (likely) send an extra amount in your refund. This assumes that someone at that former address did not steal the check and fraudulently cash it.
Whenever you move after filing...there is a special form you can send to the IRS to notify them of your change of address. Then they can redirect a returned refund to the proper place.
https://www.irs.gov/forms-pubs/about-form-8822
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
