A student submitted a group assignment as an individual and was graded on it. Later he and his partner realized they hadn't joined a group and did so for the next assignment (same Group Set, as the assignments were for a pre-lab and a lab report).
Now I am unable to see the individually submitted assignment. It isn't visible in SpeedGrader (which says that the group hasn't submitted the assignment) nor do I see it in the files for the group. Is there any way to recover the lost, graded assignment or has Canvas swallowed it forever?