Actually, the 3 year look back is pretty much for all aspects of processing with the exception of gross underreporting, which is 6 years and requires DC authorization. 2012 last filing date would be October, 2013, if extended, and that is now more than 3 years ago. As said, I suspect the 2011 and 2011 would be only useful as documentation. User could probably bundle and file 2013 1040X as if. Problem with expecting processing beyond 3 years is the issue of IRS archiving.
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