These opinions come from the California Court at https://www.courts.ca.gov/cms/npopinions.htm?Courts=Y.
The court explains:
Unpublished opinions from the last 60 days are posted together on this page as public information about actions taken by the Courts of Appeal.
After 60 days, these opinions remain available via our Case Information Search.
This seems to me to be an unnecessary inconvenience being introduced by the Court for no valid reason. So here you will find opinions older than the 60 days provided by the Court.