True, you need 2 of 3. I went once with 2 items & found it (before I even knew I needed them). On the second start-up I went to the same spot with only one item and although you can get into the area, the camp & Rapax don't APPEAR until you have both items.possible spoiler. . .
One thing, I saved before I went in and they almost obliterated me before I had a chance to fight back. I reloaded and entered again, got the same warning that I was not a Templar and walked right through, they all turned yellow but no one attacked me. I was able to complete the main objective and sneak around and fight small groups rather than the whole camp upon entry. Perhaps a random thing (whether or not they attack).