No homework? Fifth grade?!?

My son never has homework. Every once in a while, he'll have a paper due in which he has to do some sort of research, but it usually doesn't take him long to do. He does his rough draft during class time and has nothing to bring home. Sometimes I feel as if I have no idea what he is doing in school. He forgets to bring anything home, even after his dad and I ask. We'll say, "Did you bring home your completed math work?" He'll say he forgot (conveniently). We'll ask if he brought home his agenda and he'll say he forgot. How about if we 'forget' that he likes to play on the computer or that he'd like to play with his friends? Let's see how well that goes over.