I can only speak for around this part of the country because different yards sell to different foundries. The heat sinks would sell as cast aluminum, the food trays would sell as aluminum sheet, maybe cast if they are thick enough. If the shielding is aluminum, it would sell as sheet as well as the foil. The wire is a whole separate category. If you throw them together around here you would get sheet for it. Suggestion, Get some 5 gallon pails (painting contractors would be a great place to start) and separate until you have a full bucket before you haul it in.
Around here 5 gallon pails are easy to come by (oil, hydraulic fluid, transmission fluid, etc.), we have 25 gallon mineral buckets, and chemical totes. It is easy to stock pile these items.
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