Zook - Are you referring to a W Reg (2000 model) or an 03 (2003 model) bike?
The boxeye was a 2000 model, the fox eye was up to 2003. 2003 was also the time that he FZ6 (the one with underseat exhausts) replaced the FZS600. The FZS600 only ever came with 2 black, non-chipped, keys. I have no idea about the FZ6 keys though.