In much of Europe they re-use grave sites and will not have ones this old. Many of the members of the protestant reformed and French Reformed church in Ernstweiler had people that were buried in Ingweiler, especially those who lived in Einöd and Ingweiler.
As for your ancestry, are you sure they were Wery descendants? I have been trying to find a tie between the 2 families and have not had any luck as of yet.There were Wehren/Wern families and there were Wery/Very families, the latter ones arrived in the Zweibrücken area from Courcelles Chaussy, which is in the department of Moselle, Lorraine, France. I have been trying to tie Jacob's brother Johann Peter Wehren to the Werys but have not been able to do so. Once he arrived in SC in 1735 he was known as John Peter Wern.
Do you have a copy of Jacob's burial record? It is available on microfilm in the Evangelisch (Reformed) Church Records for Ernstweiler.