http://www.irs.gov/Individuals/Order-a-Transcript
Just checked my records with my NEW SSN and it looks like i have copies dating from 2009, when i used my ITIN.
That means they already transferred my tax records from the ITIN. That's one way you can check if you filed before this year.
__________________
OCT 4th 2012 - DACA approved;
OCT 11th - SSN;
OCT 15th - License;
OCT 25th - First CC approved ///
JUN 6th 2014 - Renewal sent;
SEP 5th - Renewal approved! ///
APR 24th 2016 - 2nd Renewal Sent;
AUG 8th - 2nd Renewal approved