Not NJ but it's only across the river.
http://www.philly.com/philly/news/homepage/20091118_Treasure_trove_of_history_found_at_SugarHouse_site.html
http://www.philly.com/philly/news/homepage/20091118_Treasure_trove_of_history_found_at_SugarHouse_site.html