Nobody said the obvious, use a
magnet. If it sticks it's steel. Those big brass round peices are going to net you a decent bit of change at the scrapyard (take the magnet and check to make sure there are no steel screws attached to it, if so remove them first). The copper pipe in the box is worth $3.00 - $3.50 a pound depending on your area (do the magnet thing again). The silvery white material in the trash can is most likely aluminum (50 -70 cents a pound, check for screws). I would turn it all in together as there really isn't enough of it to sort (it's mostly extrusion, which is a good grade).
Looking at that lot, I'd say you've got $100-$200 worth of scrap there. The guys who say sell the steel on Craigslist are right. They have a section for "materials" and you can browse it to get an idea of what that stuff is worth. You may have $300-$500 worth of scrap and useable stuff there if you are lucky. The brass cylinders are pretty high dollar items to a machinst if they had to buy them.
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