Old Sheet aluminum is thin aluminum materials below the grades of siding or MLC. This material must be clean and free from iron, plastic, rubber, or other attachments. Some examples of old sheet aluminum are construction aluminum sheeting, pots and pans, BX wire jacketing, and old aluminum chairs.
You can view Aluminum Old Sheet prices here: https://www.scrapmonster.com/scrap-prices/north-american-aluminum-scrap/old-sheet-scraps/52/1/1