Police in South Carolina are investigating after a hiker found skeletal remains in the woods and bizarrely dropped them off at Goodwill.

Of the seven bones the unidentified man found, five were human, said authorities in Anderson, S.C., a 29,000-population city along the I-85 corridor about halfway between Charlotte, N.C., and Atlanta.

The man found the bones at about 10 p.m. Saturday near a high-end subdivision, he later told police. He then took them to a Goodwill Thrift Store and deposited them into a cardboard box there at the drop-off center before notifying authorities, officials told the Independent Mail

Detectives retrieved the bones early Sunday, then went back to the site where the hiker said he had found them, and discovered a slew of others scattered widely, reported WYFF-TV. Anderson County deputy coroner Ty Blackwell told the Independent Mail that the bones had been there for quite some time.

Although there are some unknown family graveyards in South Carolina’s Upstate region, these did not appear to be from a gravesite. They most likely belonged to someone who had been missing at least a few years, the newspaper reported.

Identification could take months and an anthropologist has been brought in to help, the coroner’s office told media. Police called in the FBI for help with DNA testing.

“We are contacting the FBI and SLED to assist with the DNA work, as we do not have the advanced capabilities to test for DNA, but we are not calling them in to assist with the investigation process,” the coroner’s office said.