I wish I could tell you absolutely that you could file now and still receive your refund.........although it's not totally hopeless, your 3 year "window of opportunity" to file for your refund JUST closed 10/15/2016. (due date with extensions)
It is a long shot, but you could still file, and see if the IRS will honor your request since you're not too far out of their extension time (again, 10/15) This is not a done deal though, and if the IRS denies your claim, you really have no recourse, since you didn't meet the filing deadline.
If I were you though, I would file the return and see what happens......it's not totally out of the question for the IRS to send the refund...Please see below:
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