Archaeologists and osteologists unearthed skeletal remains in unmarked redwood caskets from a pauper’s graveyard Thursday morning. In final excavations to ready the site for Valley Medical Center’s expansion, they found a clay smoking pipe, a wool jacket, an assortment of pocket knives and spectacles, among other personal items buried with the 1,400 or so bodies in the unmarked potter’s field, according to a county spokesperson.