In the original Minecraft Forum thread about Herobrine, forum users posted screenshots of the brocraft livestreams and a bunch of their own faked Herobrine sighting screenshots. While some of these still exist on archived versions of the thread, not every page in the thread was archived and so not every one of these images was saved either. Some of these images that weren't archived can be seen in an old YouTube video compilation: https://www.youtube.com/watch?v=clElrb1mBmw