Federal soldiers visited the Surratt boarding house again late on the evening of April 17. John Jr. could not be found, but after a search of the house, the agents found in Mary's room a picture of Booth, hidden behind another photograph, pictures of Confederate leaders including Jefferson Davis, a pistol, a mold for making bullets, and percussion caps. As Mary was being arrested for conspiracy to assassinate Lincoln, Powell appeared at her door in disguise. Although Surratt denied knowing him, Powell claimed that he was a laborer hired by Surratt to dig a ditch the next morning. The discrepancy and Powell's unusually well-groomed appearance, quite unlike a ditch-digger, prompted his arrest. He was later identified as the man who had attempted to assassinate Secretary of State William Seward.