In the section where you find Fox, south goes towards water fountain but you need to first go west and then go up towards a hedge maze in the next area, the bone is found in a mini game accessed from reaching the end of the hedge maze along with access to behind the gate south of the fox encounter.
While i dont remember which colour is tied to which specific character, unless it changed with the update the bookholders are found in Anne's Bedroom (Revenge ghost), in the kitchen (in that room next to where the maid's beds are) and one in the attic near where the bookshelf is.
