If you use the desktop version of Turbotax installed on your own Mac or PC, you are responsible for keeping backup copies of your data. Turbotax does not retain information about your tax data file.
No. TurboTax would not have that type of information.
Look on the computer in the Documents directory. If there is a TurboTax folder that is populated with tax data with 2017 files, that is the one that was used.
Did you use the Desktop installed version or the Online web version? For online it doesn't matter which computer you used. If you used the Desktop program you need to have the file ending in .tax2017 to amend and the 2017 program installed. Don't you still have your computer from back then? If you have the .tax2017 file you can use either Mac or Windows to amend it.