The raid came one day after Manafort met with the Senate Intelligence Committee and amid his voluntary turning over of documents, the Post reported.
Further, some of the documents seized by the FBI, included those Manafort had already handed over to congressional committees, the Post reported.
A representative for Manafort confirmed the raid.
"Mr. Manafort has consistently cooperated with law enforcement and other serious inquiries and did so on this occasion as well," said spokesman Jason Maloni, The New York Times reported.
News of the search warrant was first reported Wednesday by The Washington Post.
Among those are notes Manafort allegedly took at a June 2016 meeting with Donald Trump Jr. and a Russian lawyer who set up the meeting under the guise of offering to the campaign information damaging to Hillary Clinton, the Post reported.