Okay so i was cleaning out my great grandparents house?

This is a old plantation house dating to before the civil war in middle Georgia. When I went to cellar to began cleaning I found a small metal and wood box with confederate money both cash and a few coins one witch is a 1861 half dollar and 2 small gold bricks 6 ounces. The cash has been athencated how do I get the coin because all orgnals have been authencated