WALKER, Mich. (WOOD) — Detectives investigating the thefts of hundreds of thousands of dollars’ worth of bone grafts from a Corewell Health warehouse have identified a possible buyer, police said on Wednesday.

Walker police said they’ve turned over that part of the investigation to the FBI because the suspected buyer is from out of state. They wouldn’t provide any more details.

The FBI in Detroit confirmed to News 8 that it was contacted by police but wouldn’t say whether it has launched its own investigation.

Former Corewell employee Stephen Jacobsen, of Allendale, was arraigned Tuesday on a charge of embezzling bone grafts from the warehouse where he worked in Walker.

According to court records, Jacobsen confessed to the thefts and to selling the grafts and other medical supplies.

The records don’t say who was buying the stolen grafts.

A police report obtained by Target 8 shows Corewell security caught him in the act on Oct. 24 after setting up surveillance cameras in the warehouse. They showed him loading boxes of grafts into a bigger box, then loading them into his pickup truck.

He’s accused of taking $693,000 worth of bone grafts and other medical supplies this fall. He later admitted it had been going on for six or seven years, according to the police report.

Bone grafts are processed bone fragments used in orthopedic and spine surgeries.

Jacobsen, who is free on a $25,000 cash bond, is expected back in court in December for a hearing to determine if there’s enough evidence for trial. If convicted, he could face up to 20 years in prison.