In the last two years, there have been at least 10 such burglaries at the Green Hills Memorial Park in Rancho Palos Verdes and Forest Lawn Memorial Park in the Hollywood Hills, deputies said.
The thieves either smashed a window or entered unlocked cars to grab property inside.
Anyone with information is urged to call the L.A. County Sheriff's Lomita station at (310) 539-1661.
- Get more local news headlines from Los Angeles
- Have a news tip? Send your tips, video, or pictures