Absent folder is put on my absent student's desk. The students at their table will make sure they get all of the work we do that day put in their folder. I do check their folder at the end of the day and make sure there are not tests or activities that can only be done whole class.
To prevent unfinished work from being lost, have them stick in their front folder. When they have finished something else, recess, or at the end of the day, they can look in their front folder for unfinished work.