I just found this: "My immigrant visa expired before I was able to travel to the United States. What should I do? You should contact the Immigrant Visa Unit of the U.S. Embassy or Consulate that issued your visa. You do not need to file a new petition with USCIS, but you may need to submit a new application (DS-260) and pay another immigrant visa application processing fee. In addition, you may need to submit new supporting documents, such as a new medical examination and police certificate. Please be prepared to return your unused, expired visa and visa package (if applicable). Requests to reissue or replace visas are considered on a case-by-case basis, and all applicants are required to re-establish their eligibility; there is no guarantee that you will receive a new visa." https://travel.state.gov/content/travel/en/us-visas/immigrate/national-visa-center/immigrant-visas-processing-general-faqs.html#NQ