How can I find out if my taxes were filed for 2012 and 2013? I don't think I used Turbo Tax those years. And I read that it is too late to file 2012; is that true?

Looking through my files, I don't see where a 2012 return was filed and I just recently received answers on my 2013 return. It's a complicated situation, but I am looking for a way, an IRS data base or something, to find out if returns were in fact filed. Do I request a transcript to find out?