 FBI agents arrested Kaczynski on April 3 , 1996 , at his remote cabin outside Lincoln , Montana , where he was found in an unkempt state . <unk> his cabin , the investigators found a wealth of bomb components , 40 @,@ 000 handwritten journal pages that included bomb @-@ making experiments and descriptions of the Unabomber crimes ; and one live bomb , ready for mailing . They also found what appeared to be the original typed manuscript of the manifesto . By this point , the Unabomber had been the target of one of the most expensive investigations in the FBI 's history . 
