The FBI agents were seen searching through the purchasing, administration and recreation departments as part of the investigation regarding Mack, The Times of Trenton (N.J.) reported.
FBI agents were at Mack's home for five hours on Wednesday and left with two boxes. Agents also searched the homes of Ralphiel Mack, Mack's brother, and Joseph Giorgianni, a convicted child molester and donor to Mack's election campaign.
No charges have been made in the federal probe and Mack denies any misconduct.
Celebrity Families of 2014 [PHOTOS]