Unidentified remains of of crime victim commonly disappear from police or coroner’s record keeping due to many factors. California has a statute requiring dental data and DNA samples be preserved and sent to the Department of Justice in Sacramento for testing.
https://www.forensicmag.com/news/2017/10/police-try-exhume-mob-victim-they-cant-find-remains
FORENSICS and LAW in FOCUS @ CSIDDS | News and Trends 