The search, which did not require a warrant and was not previously disclosed, was conducted with the cooperation of Biden's representatives, the report said. It is unclear whether the FBI found any additional classified material during the mid-November sweep.
Other searches of Biden's property, including the search of his Wilmington residence, were announced shortly after taking place.
In total, authorities have recovered around 30 classified documents from both Biden's office space and his home in Wilmington, including some materials that were labeled as top secret.
Special counsel Robert Hur was appointed to investigate the matter by Merrick Garland on January 12, and is expected to start his work any day, according to the report. The Biden administration has maintained its dedication to cooperating with investigations related to classified material.