The burglary occurred sometime between March 22 and March 24, police said.
Rossum has now taken to social media to confirm she was the person at the centre of the raid.
It is the latest in a string of nightmare celebrity home robberies.
Some $150,000 worth of jewelry was stolen from the home of actress Emmy Rossum last week. But on Friday, the housekeeper returned to a crime scene.
New York Daily News reported that Rossum's home was broken into by burglars who shattered a glass pane at or near the back door, then found the written combinations for a pair of safes.
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Celebrities whose Los Angeles homes have been burglarized over the past year include rapper Nicki Minaj, singer Alanis Morissette, dog-trainer and reality-show star Cesar Millan and Los Angeles Dodgers right fielder Yasiel Puig.
On Tuesday, the "Shameless" star tweeted out a thank you to the LAPD: "Thank you to the LAPD. I fully support the police efforts and dedication".
Nothing else was taken in the raid, and law enforcement sources told TMZ they believe the thief cut the power in order to turn off the security alarm.