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.
Any saved tax data files or PDF's are normally stored in Documents and in the TuroTax folder. If you do not see these files in the folder then do a hard drive search for the 2016 tax data file. It will have a file extension of .tax2016. Also check the Recycle Bin.
You can also get free transcripts of your federal return from the IRS - http://www.irs.gov/Individuals/Get-Transcript
