It's not the "Nobody beat." It's a sample of Willie Hutch - Brother's Gonna Work It Out that was used way before Chief Keef ever used it or 12Million thought of sampling it. 2Pac used it on the original version of Secretz of War and even earlier from other rappers.
http://www.whosampled.com/Willie-Hutch/Brother%27s-Gonna-Work-It-Out/
They were never release or fully made, im pretty sure they just made a cover and maybe released one song for promotion, pretty much what chief keef is still doing now. The songs released on DJ Kenn's old myspace here
nevermind, if anyone ever comes back to this thread http://genius.com/artists/Chief-keef the link I posted seems to be perfect if anyone can check me on it then that'd be great they seem to keep everything up to date even the obscure stuff