How a tomb is decorated and what is in a tomb can tell a researcher or archeologist a lot about what type of person is buried within without even knowing who is in there. Different classes of people got different types of burials. A King might have had all of his servants killed and buried with him, a wealthy merchant might have been buried with lots of gold as an offering to the gods, a poor person would likely not have a tomb.
The Constitution states that Justices "shall hold their Offices during good Behaviour." This means that the Justices hold office as long as they choose and can only be removed from office by impeachment.