Hello! I've worked in the US for summer 2014 as an Work&Travel participant (J1 visa). I have filled form 1040-nrez, but my employer won't give me my W2, I tried to contact him, but he's a careless person so it's not gonna work. I found out that you can file Form 4852 instead of W2 (I have my last paycheck with me). Can someone clarify what I need to send to IRS along the form? I mean, additional documents, copies, etc. Thank you