Contacting the IRS is the only way to know the accurate answer to that question since all returns would go through them no matter how they may have been filed.
You can request transcripts of your prior year returns or call the IRS directly to ask. Use 1-800-829-1040 to call the IRS. Use the following link to get started ordering a transcript of prior year returns: IRS Get Transcript
Be aware that tax return transcripts are only available for the current year return and the previous three years (2019, 2018, 2017, and 2016).
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