Logan says that they found a surgical pin in the victim's knee but that the pin was generic and there was no way it could help them trace the identity of the body. All implantable medical hardware, even something as small as a pin, screw, plate or a rod have serial numbers on them that identify the name of the patient and also the name of the surgeon/doctor that implanted it.
According to a lab worker, "An amazing assortment of specimens can accumulate in eight years.
Sand from two local beaches, bits of pubic hair, human detritus." However, she pronounces "detritus" as "DET-rih-duss", and an actual employee -- among millions of others who know the word -- would know to pronounce it like "de-TRY-tuss".