Final update from me - I checked today (been checking every several days for like the last 3 months)and my return finally shows up now when I click where's my r...
I got a similar response from USPS, they said that most tax returns are "accountable mail" that has to get signed for by tax agents directly at the USPS sorting...
This exact same thing happened to me too.USPS just shows "in Transit".When I check my return status it shows no record that I filed a tax return.I mailed both F...