You couldn't have e-filed your 2015 tax return at the same time that you filed 2016. TurboTax Online only has one year open to file at a time. The 2015 online program closed in October of 2016, after which the 2016 return became available.
If your account shows that your 2015 tax return was "started" then you never e-filed it through TurboTax. You may have printed it out and mailed it, though, or used another method to file.
You can use this link to the IRS to get a transcript of your 2015 tax return if you filed it. You can also contact the IRS at 800-424-1040
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