Yeah I found some in CEA and they looked incredible. I haven't found a single one in 4 but I just watched them all on Youtube, they were very good. I agree about the story in 4 as well, it's easily my favorite of the series so far. It's incredibly deep, feels way more sci-fi than anything in the previous games. The idea that the Forerunners were being decimated by the Flood and tried to turn themselves into digital beings is great, and Didact punishing humans by turning them into digital beings for his army is a cool story element as well.