Although I currently teach at the high school level I have had my share of students that turn in work late. When I taught 5th grade I ran into issues and even at the middle level. I developed this to keep track of student missing work so that when I conferences with students and parents and they inquire why the grade is low, all the info I need is actually filled out by the student.
I like to print these sheets a different color than white so they stick out. For one class I use yellow, or another pink. They can all be blue though--that's up to you.
When students don't have an assignment they walk over to a basket I have with these sheets waiting. Fill it out and hand it in to me as I am collecting work. It forces them to take ownership of their missing assignments. If they refuse (which doesn't usually happen) I ask them to stay after and complete--there's incentive right there!
Once the teacher views the excuse and if necessary discusses it with the student, then teacher makes a decision to let students make it up or not. To be honest, I make it clear it my syllabus about my late work, so hopefully implementing this sheet too keeps late work at a minimum. Can even be used at lower grades too.
I make my homework assignments three points each. I find this gives students a good way to see their grade grow and make it meaningful. If you prefer to change it simply white it out. Hope this helps you keep students organized!