Authorities in Kentucky say they are looking for an armored-truck driver who disappeared more than a month ago with a vehicle believed to have contained as much as $850,000.

According to Fox News, 29-year-old Mark Espinosa was last seen on December 5 at an area near the Jefferson Mall in Louisville.

Local police have identified him as a Garda World driver they believe was involved in a conspiracy to steal “a large amount of U.S. currency” being stored in the armored truck.

Louisville Police Lt. Steven Kaufling addressed the incident in a news conference last week, alleging that the suspect had “taken steps to plan out this theft and has taken steps to cover up his planning.”

Several days after he disappeared, the company said it terminated Espinosa’s employment for unspecified reasons. His family is reportedly cooperating with investigators working this case.

The missing man has been described as a white male with black hair and brown eyes, according to WHAS. He stands about 5 feet, 10 inches tall and weighs about 230 to 235 pounds. He might have been destined for Florida or Texas, where he has relatives, according to police. They say he could have also been headed to the Northeast or Western U.S.

As of the latest reports available, federal authorities had joined in the search for the suspect. The FBI has contributed $10,000 to the $50,000 reward being offered by Garda World for information leading to the return of the stolen money along with the arrest and conviction of those responsible.

Those with tips related to this investigationcan contact the local FBI office by calling 502-263-6000.

[Featured image: Mark Espinosa, Louisville Metro Police Department]