You can contact the social security administration. There is a substantial fee for W-2 copies, unless you are applying for benefits and need to prove your eligibility. If you just need to know what your social security wages for those years were, you can get a report for free from Social Security.
Or you can ask for a "wage and income" transcript from the IRS. You'll have to use the paper form since the online form doesn't go back that far. https://www.irs.gov/Individuals/Get-Transcript
