Jakubowski is believed to have stolen 16 high-end guns from a Janesville store earlier this week.
Last Tuesday night, he broke into the Armageddon Gun Shop in Janesville and took several high caliber handguns, a military-style helmet, at least two semi-automatic assault rifles, and a bulletproof vest, according to Fox News.
Investigators received an additional 150 tips and leads Monday, bringing the total number to more than 500.
On Tuesday night, police also responded to a report of a auto fire and discovered a burned vehicle registered to Jabukowski, located just a short distance from the gun shop that was burglarized.
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"Additionally, federal authorities are using their resources to investigate any leads that may be developed outside of this local area", the sheriff's office said in the statement.
On Thursday, tactical teams raided Jakubowski's house and southern Wisconsin schools were on lockdown, after what local law enforcement officials said was a threat of an unspecified attack. Police warn that Jakubowski - who is 5'10 and 200 pounds with brown hair and green eyes - is obviously "armed and dangerous" and likely protected by body armor. It "includes grievances against government and personal angst toward anyone or anything other than natural law or rule", the Rock County Sheriff's Office said.
"Basically (Jakubowski) is angry at all government officials, whether it's the president, local officials or law enforcement, he has a dislike for anyone that has authority or governmental power". Authorities believe he torched it purposely.
"As the search for Joseph A. Jakubowski (M/W, DOB: 07/21/84, 5'10", 200 lbs, green eyes and brown hair) continues this Sunday night, investigators are continuing to work through the evening to attempt to locate this armed and risky suspect. He served time in prison for attempting to seize a gun from a police officer in 2009, according to Janesville police. A video released Friday shows a man who looks to be Jakubowski mailing a thick envelope to the president. A burned vehicle registered to him was found nearby.