I'm sure it will be opened again to grab some DNA.
It was finally re-buried in a 500lb block of cement to discourage grave robbers.
An attempt had been made earlier to steal the body and hold it for ransom.
I believe that some tissue was saved from his autopsy in 1865 as well as some hair that could be used for DNA sampling.
His only surviving son Robert died about 1921. He only had daughters and I'm not sure if there are any descendants beyond that.
It is an interesting story though...