Turns out the package contained horse manure. The package was found Saturday night, December 23, in the tony Bel Air neighborhood after it was dropped off at a neighbor's house.
According to NBC Los Angeles, a Los Angeles Police Department bomb squad arrived at Mnuchin's Bel Air residence in response to the delivery of a suspicious package, a large box covered in wrapping paper.
Police cleared the scene and said the investigation has been handed over to the U.S. Secret Service.
US Secret Service told CNN they were aware of the incident but referred all questions to the LAPD.
The Treasury Department did not immediately respond to a request for comment Sunday.
His wife Louise Linton courted controversy earlier this year when she appeared to disparage a woman on Instagram for having less money than herself and her husband.
The package was found at a neighbor's home but was addressed to Mnuchin, which police say raised alarm bells.
At least one road in the area was shut down after the package was discovered.
The package was found Saturday night in the tony Bel Air neighborhood after it was dropped off at a neighbor's house.