Ask the IRS ... request an account transcript for all those years. https://www.irs.gov/Individuals/Get-Transcript
For an answer to that question you will need to contact the IRS.
Here is information on how you can reach the IRS by phone for further assistance:
https://ttlc.intuit.com/replies/3301592
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You can use the following link to order copies or transcripts from the IRS.
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).
How can i check to see if missed ayear filing
Ask the IRS ... request an account transcript for all those years. https://www.irs.gov/Individuals/Get-Transcript
How can I check to see how many years I haven’t filed taxes
@rex2468a You can view your tax records via the IRS Get Transcript Service. Here is an additional resource that will allow you to create or view your tax account: View Your Account Information (IRS)
To access prior year returns, please follow the instructions in the following FAQ. https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/00/27010