Any tax returns started or completed using either the CD or Download software installed on your personal computer are not stored online by TurboTax.
Any tax data files or saved PDF's will be on the computer where they were created. The TurboTax program would normally store any tax data files and PDF's in Documents and in the TurboTax folder. Unless the default storage location was changed by the Administrator or a Windows upgrade moved the files to another location.
If the PC was upgraded to Windows 10 then the files may be in the Recycle Bin. If not then do a wild card search of all local, external or networked drives for the tax data file. The 2016 tax data file has a file extension of .tax2016, but you should use the wild card search using *.tax*
