In the anime, when the Pacifista was locking onto to Usopp for its next attack, its bounty detector labeled him as Sogeking, even though he was not wearing his Sogeking mask (though his nose or the Kabuto could have given him away). Although it is a fact that the newspapers (2 years later) managed to recognize Usopp, as he was labeled "Sogeking", proving the Pacifistas have the capability to recognize him.