If you used the desktop software to prepare and file your tax return then the tax file could only be stored on your own hard drive or any backup device you used like a flash drive. It is not stored online.
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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