<prompt> Human: Within a week or so of each other, I received a weird letter from the IRS, and Mint emailed me letting my know my free credit score showed a 100 point drop. The Letter thanked me for a correspondence received Oct. 31 2016 which they determined no action is necessary on my account. I am not familiar with any of this. The only other actions which have taken place which could affect my credit score is closing my Car Loan account after paying it, and closing a credit card account which I just wasnt using. Does this sound like someone has stolen my identity, or at least attempted to, which could have affected my credit score?  <response>: Why not just call the IRS and ask about the letter? If they say no action is necessary, it cant hurt to ask, can it? 