How do I find all the statue pieces? Specifically, how do I find the Bandit's camp
Been a while....ehm... Bandit's Camp will be unlocked during the Bandit Attack story, Logan will reveal its location.
The pieces can be found at the shrine of the ruins after you examined the statue. The other two are at bandit's camp when sneaking around and as part of a quest for the either day or night witch at the swamp.
Just keep reading the questlog, it tells you what to do step by step.