Where is rexs bone of white wolf of icicle creek

It's supposed to be in the front hall [where all the history pictures of Icicle Creek are]. Nancy will point out the indentation spot of where the Rex bone should be, but it's missing.

Once you get to that point in the game, you realize Lou took it. Nancy will make him feel guilty about it and he will give you the keys to his closet, to obtain the bone.