Hi Ken,
Usually if you spray the Ceph, to get it used to the conditions, water will seep into the traps and they seem to be thankful for this. So if you don't spray your plants, possibly adding a little water would be beneficial.
Regarding having the lid closed, this is due to temperature. If it is to hot the Cephalotus will close its lid to stop evaporation of the valuble secretions inside the trap. Where do you have the plant positioned? The reason is my first attempt at a Cephalotus failed as I placed it in too hotter conditions when it was just adapting to the new environment, which lead to the plant dying. With this plant I have now, I left it in a warm environment which only gets the rays of the sun in the morning because they aren't as hot as midday. After a few months the plant is pitchering happily again.
Hope this helps.