Cap kits SHOULD include every electrolytic capacitor, but most cap kits don't include the filter cap or the non-polarized capacitors because they rarely fail.
Now, some cap kits like the 20EZ cap kit don't include ALL the caps for some reason, which bothers me. I usually build my own cap kits so that I can replace them all.
Also, some "cap" kits will include other known problematic parts like resistors, etc...