Which should also be a red flag, if this individual was a credible threat they wouldn't have granted bail.
I can't even imagine the headlines that some of my neighbors would have "Man with Arsenal and stockpile of thousands of rounds of ammunition" presented in a slant. Meanwhile he had a few buckets of 22lr, and a half dozen rifles.
Given the evidence we've seen, the memes, and what would clearly pass as joking, there isn't really any "Here's my plan for x date" type smoking gun.