The TRC concluded that it may be impossible to ever identify the number of deaths or missing children, in part because of the habit of burying students in unmarked graves.[51][52][53] The work is further complicated by a pattern of poor record keeping by school and government officials, who neglected to keep reliable numbers about the number of children who died or where they were buried.[6] While most schools had cemeteries on site, their location and extent remain difficult to determine as cemeteries that were originally marked were found to have been later razed, intentionally hidden or built over.[53][54]