Around 12:30 p.m., the store was immediately cleared out as Durham County Sheriff's Hazardous Disposal units responded to the 5500 block of Durham-Chapel Hill Boulevard.
"The volunteer who found it very calmly took it outside the building before alerting management, who called law enforcement," the company wrote in a post.
Officials with the business said the store closed briefly during the incident but has since reopened.
No one was injured during the incident.