If you are owed a refund for 2017, then mail in the signed tax return. You have three years to file it and still receive your refund. After three years you forfeit the refund if you do not file it.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s. Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS/state received the return
https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment
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