The U$.$S$.$ Bureau of Artifacts, a federal agency, produces collectible items such as commemorative coins and medals. Due to prior incidents of theft, a video surveillance was conducted on the production line. The video surveillance caught Sean, a line employee, dropping medals on the floor and later picking them up and putting them in his pocket while sweeping the workplace. Based on the tape, Mint officials searched Sean's locker and found the stolen medals. Can Sean have the search invalidated on the grounds that it was unjustified? Explain your answer.