Tax treaty for alien resident

Hello, I am an international student from China on a F-1 visa. I am considered as a resident alien for tax purposes because I arrived in the US in 2010. I am still eligible for U.S.-China income tax treaty as a resident alien. But I have not received any 1042-S form this year, which means no tax has been exempted. My W2 form also shows no difference between wages in box1 and state wages in box 16. I wonder how I can claim the exemption in tax return?

Thank you so much.