The FBI confirmed on Twitter that it was conducting an investigation near a residence in Bedford, but said there is now no threat to public safety.
The person placed the package in a wooded area and called police, who alerted the FBI and the Bureau of Alcohol, Firearms and Explosives.
The FBI's New York field office said on Twitter that it was "conducting an investigation at and around a residence in Bedford, New York".
Soros, 88, is well known as a lightening rod for criticism from those who oppose his strong financial support for liberal causes. "There is no threat to public safety, and we have no further comment at this time", the tweet said.
Local police have turned the case over the the FBI's NY office, which tweeted on Monday evening that it's "conducting an investigation" near Soros's home.
He has spent billions of his own money funding human rights projects and liberal democratic ventures around the world and has been a large donor to the US Democratic Party.
Republican Representative from Florida Matt Gaetz also accused the billionaire of funding the migrant caravan that is moving towards the US-Mexico border.