Cavetown Cemetery is located in Brown Township, Washington County, Indiana; north of Campbellsburg, Indiana. It is a church cemetery in the country, and the church is still standing. It would be worth your while to visit the cemetery.
I would recommend going first to the Washington County Historical Society at the John Hay Museum in Salem, Indiana, where you will find lots of information on the Rosenbaum family and help on the cemetery. Open on Saturday, but not Sunday or Monday. Go to the GenWeb county site for address and telephone number. From the Washington County, Indiana, Brown Township Cemetery Book by John Hughes, and published in 1988 by the Washington County Historical Society, Charles Casper Rosenbaum is listed as buried in Cavetown Cemetery, and his wife Christina also.