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.
TurboTax would not have any information on a sale of the TurboTax software from another website other than TurboTax.
By default, any tax data file or PDF saved by you will be located in the Documents directory and in the TurboTax folder on the C: drive of the computer where the software has been installed.
