How were those returns prepared? If prepared online, you may be able to download the 2018 and 2019 return PDFs. I'm not sure if the 2017 return would still be there, but it's possible. And if those PDFs include all the worksheets, they might include the depreciation summary report and asset information pages. If you used online TurboTax, we can tell you how to download past year PDFs from your online account.