The copper was to be installed during a wiring project, deputies said.
One of the employees at the Lost Lake Resorts actually confronted a suspicious man who detectives believe may have either been the culprit or an accomplice. However, the employee was not able to detain the man.
Thurston County Crime Stoppers released a bulletin Tuesday asking the public to help. The group is offering a reward of up to $1,000 for information leading to an arrest.
A suspect is described as a white male, 6-foot, 200 pounds. At the time, he was wearing a yellow, black and white jacket. He was also wearing jeans.
Crime Stoppers of Thurston County's phone number is, (360) 493-2222.