I wonder if there were email or social media posts encouraging violence.
What about his infamous entrapment meeting? There must be planning correspondence. What is the criteria for sedition?
Probably emails about wanting Trump d3ad.
Also after his 8647 he probably has messages to people talking about it. Could be something as simple as “I wonder if anyone will take this advice...I hope so”.
He took the photo and probably shared it with close friends via text or messaging app. All those comments would be pretty eye opening.