both the IRS and Turbotax only keep returns for 6 - 7 years. so if used online for 2008 - 2010, they no longer exist. however, if all you need are the w-2s for those years, you can get copies from the Social Security Adm. there is a fee.
https://faq.ssa.gov/en-us/Topic/article/KA-02501
