i would say.... sometimes they just store it up for a more dramatic display later on

Yes, look if stuff is accumulating in the body, above the vent. Is it turning hard anywhere when you handle the snake? or are there visual changes in shape?

Also there is a decrease in volume as rhodents get digested. Bone gets completely dissolved and digested. They do not necessarily poop as often as they eat.

Just watch out for visual changes or hardness in the lower third of the body. Anything unusual there?