In this business, I've heard of people taking metal benches from parks and even street light poles. All you need to find is a scrap yard that is willing to shred it and not ask questions.
With Cu prices this high, many yards are hiring security to watch the place overnight.
Thankfully, laws like the one posted earlier are getting passed all over the country. It is easier to go after the yard buying the scrap than the people stealing it.
Eventually you will have four thugs with a light pole and nothing to do with it.