preparing all of this and walking to the post office to mail it, all while carrying guns(s), ammo, a video camera, and digital camera.....all in the two hours between shootings. What private place did he have to prepare all of these films, photos, and writings???? He had at least 3 roommates.
not possible.
Entirely possible.
The manifesto and the videos could easily have been compiled over weeks or months.
He could have dropped the package off at a Fed-Ex box en route to the second crime scene.