It's a complete list if you believe the sender. Everything was found if you believe the leaders. But how would they know? If they know everything that was part of the situation, what's to say they don't know who did it? Why keep it from us? Some arbitrary "rule" they have to follow?

[ if there's one thing he does not do well, it's trusting other people. temenos can almost sense paranoia coming off of him in waves.

but he does sit back a little after, before he gets so carried away he justifies himself of leader murder ]

As for the paper, it doesn't have to remain on the scene. Rita carries her book around with her— the objects go inside the book and then out, the paper never leaving the binding. It can be set on fire just as easily, the wind scattering the ashes until there's nothing left.

It's not impossible.