From what I read, it seems that on paper submissions as well as No Submissions remain on students to do lists even after a grade is entered. 

I am still wondering if there is a way to avoid students having a On Paper assignment in their to do list permanently even after it is graded? How do I have 3rd graders not get confused with an On Paper submission type or a No Submission type if I am receiving it differently but need the spot in the gradebook? How can I avoid the hundreds of inboxes with the question of "I did this already, why is it in my to do list?" 

What do you guys suggest?