Concern over the number of keys and the unknown people who have them has led to a change in the locks at Warren County Courthouse. The Administrative Building on Locust Street could be next.County Building and Grounds Committee chairman Carl E. Bouldin informed fellow members on Tuesday he had the locks changed without their approval out of concern for safety.“I had the locks on the front door of the courthouse changed,” said Bouldin. “After talking with some people, I was told there were a lot, I mean a lot, of keys out there.