Not sure what you mean by "early tax years." Are you referring to tax files stored on your own hard drive? You need the software for the tax year to open a tax file. Or did you save it as a pdf so that you can open it more easily?
https://ttlc.intuit.com/questions/1901659-find-your-tax-data-file-in-mac
https://ttlc.intuit.com/questions/1900721-find-your-tax-data-file-tax-file-in-windows
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