They were reused for further burials in the same family over several generations .
They were would often have become very crowded with sarchophagi and grave - goods , though the known survivals have now been emptied , either by looters or archaeologists .
They were reused for further burials in the same family over several generations , and would often have become very crowded with sarchophagi and grave - goods , though the known survivals have now been emptied , either by looters or archaeologists .