TurboTax only retains online tax returns for the past 7 years, the same retention period as the IRS.
If you used the desktop CD/Download editions installed on your computer, the only copy of your tax data file and any PDF's will be on the computer where the return was created. TurboTax does not store online any returns completed using the desktop editions.
If you have the .tax files for those tax returns you can try using a service from the following website, it will cost you and is not recommended by TurboTax - https://www.taxprinter.com/