I can tell you where in the cemetery someone is buried unless there is a tombstone or gravemarker on the site. You see over the years many markers have disappeared or the graves were never marked. The church records only tell you who were buried in the cemetery, not where they were buried. Also in the Edgard cemetery many graves were loss because of river encroachment and the subsequent repositioning of the levee and highway.
I have not done research on the Laporte family. There was a Louis Laporte who cohabited with and later married a former slave Olivia Brown. They had some connections to the Becnel family. You can write to the archdiocese of New Orleans and request a certificate for the information.http://www.archdiocese-no.org/archives/