Dude...

I had the similar problem....you need to submit following (http://www.istaxes.com/taxes/form-8316.html)

• a completed Form 843
• a completed 2008 Form 8316
• a copy of your W-2
• a copy of the visa page of your passport
• a copy of Form I-94
• a copy of your work authorization (copy of your EAD authorizing OPT or Economic Hardship)
• a copy of front and back of your Form I-20 or DS-2019 authorizing CPT
• a
  written statement that you unsuccessfully requested a refund of these
  taxes from your employer. (This can be the statement you obtained from
  your employer, or your own statement that you were denied refund of
  these taxes by your employer and were unable to obtain a statement from
  them.)