Unusual for it not to have been ‘Claimed’ by anyone.
Not if it was a failed mission.
Plus we have already heard that all the passengers were cleared of anything suspicious...
I think they are just grasping at straws to look like they are doing something.
>>Unusual for it not to have been Claimed by anyone.
I think it probably was by the pilot - a suicide note of some sort, but it’ll never see the light of day.