At this point, lets deal with the 2017 tax return only. What matters here is the filename extension of the 2017 tax file on the stick. What is the filename extension? It might be .tax2017, but I doubt it since TurboTax is not licensed for commercial use by someone like an accountant. But if anything, the filename extension might tell us what program the accountant did use, so we have a starting point.
If the filename extension is .PDF, then chances are you won't be able import anything. While TurboTax can import from *some* PDF files, it depends on what specific program created that PDF file and what you can import from it is "extremely" limited. Basically, personal identification information only, and that's pretty much it.
