<prompt> Human: I completed the e-file of my w-2 form and the IRS rejected my submission due to my social security number having been used to file this year already. I dont like jumping to conclusions but I actually never received my W-2 in the mail, my employer had to print out a copy of it for me, despite them having mailed them out about two weeks ago. Ive had an issue with my neighbor and them not delivering my mail to me promptly when its placed in their box instead of mine...I ended up filing my taxes, but have gone the paper route and mailed it out today, I will be calling the IRS on Tuesday. Has this happened to anyone else? Any advice? Edit: You have all been a great deal of help! As I said, I did send in my return in the mail already and will be sending in a Form 14039 as well with the necessary proof of identity. I read about the Anthem hack that occurred recently, I have my medical insurance through blue shield... Might this be the case for me?  <response>: Hope this helps. 