TurboTax does not have access to any tax returns that were filed with another company for a prior year. You would have to get the copy of your 2017 tax return from the company where you filed or from the IRS.
The IRS can provide you either a copy of your return for a fee, or a tax transcript of your return for free. You can also request a Wage and Income transcript from the IRS which will show their copies of all of your income documents for a particular tax year.
Use this link for more information about requesting the transcripts from the IRS: https://www.irs.gov/individuals/get-transcript
Also see the following TurboTax article for more information.
https://ttlc.intuit.com/replies/5578532
