I am currently sitting on approx 77lbs of copper I have found in vacant houses I clean out. I had 2 houses from last year that was used as a "stash " house I guess for the local thieving kids in the nieghborhood. These were piles of the copper tubing and lines .The banks dont want it, everything in the houses go, either to be thrown out or kept by us. I also find ALOT of extension cords and good quality jumper cables. I bought , as a gift, an old 1950`s welder for $50 from a guy and the cables alone were at least 15lbs of copper.
I also have kicked out numerous squatters who stay in the houses to strip them. Got 1 to do tomorrow, should be fun