If you saw it before, I don't know why you are not seeing it now. I don't know what "bumped off by default" means. TurboTax can keep at least 7 years of tax returns in an online account, possibly more.
I'm assuming you used Online TurboTax all those years. If you prepared any returns in the desktop software (CD/download), they will not be in an online account.
If you used the account recovery tool and followed all the steps above, and can't find another account with your 2014 and 2015 returns, here's how to contact TurboTax Support for realtime assistance:
FAQ: What is the TurboTax phone number?
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