This is assuming that you believe that Anonymous got a hold of an FBI agent's laptop
During the second week of March 2012, a Dell Vostro notebook, used by Supervisor Special Agent Christopher K. Stangl from FBI Regional Cyber Action Team and New York FBI Office Evidence Response Team was breached using the AtomicReferenceArray vulnerability on Java, during the shell session some files were downloaded from his Desktop folder
From here http://pastebin.com/nfVT7b0Z