>> the fbi was able to match up the tear from that roll of crepe paper which was in the trash at the bookstore to one of the actual flags. >> they also found bits and pieces of paper. the fbi painstakingly pieced them together. >> and that note actually was a duplicate of one of the notes that was left at one of the sites that mr. weiner was directed to go to after the kidnapping of his wife. >> armed with a search warrant, the fbi found a stack of metal file cabinet rods in kopenheffer's shed, similar to the ones found with the ransom notes. the fbi's forensic metallurgist analyzed the rods with a scanning electronic microscope, and discovered some unique marks on the side of the rods created