Both the Deptartment of Education and the Department of Health and Hospitals offer ways to obtain duplicates or obtain verification of personal information. 

The Department of Education ( high school diploma or education verification):
http://www.doe.state.la.us/lde/eia/601.html

The Office of Vital Statistics (birth certificates): http://www.louisiana.gov/wps/portal/.cmd/cs/.ce/155/.s/3978/.r/