Can you get another "original?" Go to court and try. You want to cover yourself in case they don't have the original.
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You interview letter is very elaborate. It lists everything you need to bring. Also uscis.gov has a very good instruction on the subject.
NYC EXPERIENCED IMMIGRATION ATTORNEYS www.myattorneyusa.com; email: email@example.com; Phone: (866) 456-8654; Fax: 212-964-0440; Cell: 212-202-0325. The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter.