Just because the outside is shiny, doesn't mean the inside is clean, from me asking around (now keep in mind, I'm going by telephone calls, emails with pics etc as I'm dealing with tonnage) the yards I've spoken to say #1 is nothing outside, tarnish, solder dirt and nothing inside, oil, dirt, fluid etc. If it's "pink" I think they will know it's "old" copper and probably been used, but who knows.
After all that, like big said, your wasting your time when you could be looking for more, hope this helps mate!
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