In the uk rail industry we have people stealing copper all the time. They cut a live cable, attach it to the back of a truck and drive off. Sometimes this can yield them kms of cable.
We also had issues where people would jump over fences into depots, use scaffold boards to build a ramp over the 2.5m fence, and then use forklifts to roll big reels of cable up the ramps and over the fence on to the back of a waiting truck the other side.
Copper cable theft is 100% a massive issue in the UK.