Fortunately, you may have more proof than you think or may be able to get the one you needs.
I can't find my original U.S. birth certificate or marriage record what can I do?
The NY State Department of Health Vital Records office will help you get it or you can order your birth certificate online from NY and many other states through VitalChek Network at vitalchek.com.
Is it possible for me to use proof of residence documents in my spouse's name?