Access to prior year returns.
https://ttlc.intuit.com/questions/3402465-how-do-i-access-my-prior-year-2016-or-earlier-return
You can get a free transcript from the IRS:
https://www.irs.gov/individuals/get-transcript
How do I get a copy of a return I filed using online TurboTax?
https://ttlc.intuit.com/questions/1900748
How do I get a copy of a return I prepared using desktop TurboTax?
https://ttlc.intuit.com/questions/1900639