The burglary happened Saturday evening at a home on the 1700 block of Tanager Drive which was tented for fumigation, according to the Costa Mesa Police Department.
Video from inside the home shows the suspect searching through a walk-in closet, taking over $4,000 in property.
The suspect was wearing a beanie with a small green alien and the slogan "SAY HELLO TO MY LITTLE FRIEND" underneath the image. He also appeared to be wearing a ski mask, according to police.
Anyone with information about the suspect or incident is asked to contact detectives at (714) 754-5120.