Well, I dont think the problem would be your passport or visa. Good thing you guys informed the police that will serve as a evidence that your passport can be replaced from Nepalese embassy in DC. But the main problem might be SSN, to get your SSN, you might have to get a letter from a employer within the campus. One of my friend lost the SSN, and she was hunting for jobs on-campus for long time as SSA said she needs the letter so that they can issue the replacement SSN with the same number.