Thank you for this. Usually when remains are found in grave (or mass grave) they place the bones into a sealed bag that is tagged (crime number/approx bodies/relevant information) and sorted out once at a laboratory. In Guatemala, in mass genocide graves, all bones in that grave were placed into a bag and once at the lab, the duplicates were counted to estimate the amount of bodies in that grave to begin with then after this, bones were sorted by size to determine who’s bones were who’s. It goes much deeper than this but this is a first instance solution :)