Hi Yanbo
I'm sure that the 696 should have a code card, I certainly got one with my 1100 Evo (there's no red key with these models).
You say you have the handbook so have a look under the immobiliser section - it will tell you if there should be a code card. It's only needed to override the immobiliser if it or the antenna ever malfunctions. It's unlikely that you'd ever need it but it does give you piece of mind.
I you can't trace the original and it bothers you, I think these people can retrieve the code from either the ECU or clockset, I can't remember which.
http://www.motomatrix.co.uk/
You could also speak to Avanti but I think they can only access the earlier ECUs.
http://www.avantiraceparts.co.uk/page.php?id=19