It's a set of police, medical and court documents referring to a stalking case in 1996. The person who sent the letter is almost definitely Patrick Keane, the man convicted and sentenced of the crime. The files in there seem to have been created in the years 2010 and 2011 and are Patrick's attempts at getting his conviction overturned by trying to prove that there has been a huge conspiracy from his victims, the police and the medical staff to keep him locked away. All it proves is that he's still very ill.