Adam and Eve probably didn't have poop chutes. More than likely all the food they ate was absorbed into their systems and used. Nothing inefficient was done in the perfection of the Garden of Eden. If they had poop chutes, they were simply there to spread the perfection-perfume among the plants and animals of the Garden.
Angels are efficient right now, even though our guardian angels live here with us, invisibly, to protect us. Did you ever go to the fridge to get a midnight snack, only to find that it was gone? You knew you had left it there, just for the midnight time. The wife said she didn't eat it. The kids grew up long ago and are long gone. What's left?
Your guardian angel. He (she?) couldn't resist a little snack, right?
What's your experience with missing snacks in the night? Do you think it might have been your guardian angel who ate it?