The FBI searched the Penn Biden Center offices in mid-November, according to two sources familiar with the investigation, after lawyers for President Biden had found about 10 documents marked classified there on Nov. 2. The material originated from Mr. Biden’s time as vice president.
It is not clear whether FBI personnel found any additional classified or presidential material during the mid-November sweep.
Two sources told CBS News the search was conducted with the cooperation of Mr. Biden’s representatives. A search warrant was not sought.