A piece of history is back where it belongs, after a year-long police investigation. Over 13 months ago, a historic guidepost that dated back more than half a century was stolen right out of the ground from a park in Pennsville, Salem County. The sign has been around longer than most living in Pennsville can remember and holds a lot of weight for the community. “It’s our heritage, it’s history. Generation after generation has rode by that sign,…