我和你的情况很类似,这是我们学校的人给的答复: As long as your application for the OPT extension was received and receipted before your standard OPT expires, no further proof is needed. The rule about this is below, and can be found on this official site: http://www.nafsa.org/resourcelibrary/default.aspx?id=9578&terms=stem+extension. Students who timely file an application for the 17-month OPT extension will be able to continue employment while the extension application is pending, until a final decision on the I-765 or for 180 days, whichever comes first. And this handout: http://www.uscis.gov/files/article/OPT_4Apr08.pdf 所以你不需要其他证明。