OLD CITY -- A researcher says some of the over 70 full sets of human remains excavated from a Philadelphia construction site last winter have gone missing.Kimberlee Moran, the director of forensics at Rutgers University-Camden, says the bones of about 12 people can't be located.In February, construction crews working on a 10-story apartment building in the city's historic district started unearthing coffins and fully intact human remains.That's when owner PMC Properties contacted archaeologists.The site was a burial ground that dates to 1707. All the remains were supposedly exhumed in the 1800s and moved to a different cemetery, but that apparently didn't happen.Researchers at Rutgers University-Camden removed the remains and are studying them before they're re-interred.Jonathan Stavin, executive vice president of PMC, says locations where bones were stored are being checked again.----------