Prosecutors have discovered six boxes stuffed of files connected to the case of convicted Philadelphia cop killer Mumia Abu-Jamal that supporters believe may be proof that his innocence has been suppressed by authorities. The former Black Panther is serving a life sentence for the 1981 killing of Philadelphia Police Officer Daniel Faulkner. Philadelphia District Attorney Larry Krasner said his assistants were looking in a storage room for some pieces of furniture at the end of December when they came across the boxes. Five of the six boxes were marked “McCann,” a reference to the former head of the office’s homicide unit, Ed McCann. Some were also marked “Mumia,” or his full name, “Mumia Abu-Jamal.” It’s not known exactly what’s in the boxes but Assistant District Attorney Tracey Kavanagh wrote “nothing in the Commonwealth’s database showed the existence of these six boxes,” and said that prosecutors are “in the process of reviewing these boxes.” The discovery comes weeks after a Philadelphia judge reinstated appeals rights to Abu-Jamal, saying the former radio journalist and activist should get another chance to re-argue his case.