It might be there...but just not in "Documents".  The "documents" doesn't show up at all for many people..

Instead

Click on "Tax Home", then scroll down on the rt-side screen.

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2012 - those documents and return have probably been deleted since Turbotax only retains the last 7 years. 

Ahhhh.......true, 2012 may be too far back.   But more recent  years prepared online should show up.