A penny is worth more as scrap. You can't leave anything on a job, door frames, windows, wire. A lot of power poles have the ground conductor cut off at where you can reach. Several times a day the trash is gone through at work, most of them put everything back because they don't want trouble. We did have a dock plate fished under a fence.
As for manhole covers, that is trying to kill anyone on a bike, and maybe even a car.
Part if the trouble is that scrap yards take the stuff, even if they do have signs stating "we videotape every sale" and take a DL number. You know that if I show up with 200 pop cans, 70 feet of aluminum wire, a new door frame, and 6 manhole covers, I am not cleaning out the shed.
