When I worked in Massachusetts most salvage yards would not take specific amounts of copper off just anyone. You had to prove you held a trade license conducting business as such to bring in copper. State inspectors would sometimes make surprise stings to catch em buying off unlicensed persons. We once had them show up to our shop to see if we would sell them any copper we had not yet taken to salvage. It doesn't take any time to steal copper from a/c or electrical systems. Some people have died trying.
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