I have a hard time believing it, but it’s so: not a trace. Look at the size of that operation! And nothing endured. Do you know why? An ancient curse, I suspect. Wikipedia on the neighborhood:

The Gilbert Cemetery, set aside for slaves in 1841, eventually became the final resting place for many residents of Plunkett Town. Up to 1700 people were buried there. The Old South Motel and Dining Room (or Old South Motel and Liquor Store) later occupied the property and the owners allegedly removed many of the headstones.

During the construction of the I-75 interchange at Cleveland Avenue, GDOT discovered the damaged burial ground and attempted to make amends by erecting a 7-foot statue of Jesus Christ (depicted as a white man). This led to a federal lawsuit for violation of separation of church and state, as well as public outcry over the insensitivity of placing a "white Jesus" over a black cemetery. The compromise solution was a roadside memorial featuring a marble obelisk and a number of uniform, concrete headstones marking the approximate site of the cemetery.