I received the same 3176C yesterday on my TY2016 Lawful Money Redeemed return. Not sure why; filed the same for 2014 & 2015, no issues. Interestingly, they sent me a letter about 2015 saying "there was evidence of fraud" regarding my return and therefore couldn't issue my (significant) refund. Caught me off guard, since the sleeping dog has been silent for a while. Going to R4C tomorrow and post in my evidence repository case file.

"Let's see if he's awake..."? Who knows...