Is this the famous Shreddies map you speak of? The Oak Island Tourism Society owns this image and is a scan of what we have. Recently, a member of our Society sent me another scan (much better) telling me of his long time fascination with Oak Island that was pretty well initiated by the "treasure map" he found as a kid in his cereal box. This is not the full image as my scanner is not big enough, but it gives everyone an idea what they looked like.
It is indeed high detail and I agree with your comments of sensationalism and myth, but highly entertaining none the less, and attractive. The so called Ghost Dog is one of the better known Oak Island ghost stories along with mysterious crows, bumping noises in the night, specters and all sorts of unusual, unexplained phenomena.