I can't imagine shelving units being made from SS. Unless they were outside 100% of the time. 9 times out of 10 they are steel. If you sell them on craigslist or eBay you will make way more money than if you sell them as scrap. At my local yard they would go as shred or general steel which is about $0.10lb.
However, how and where you sell your materials is 110% up to you. I wish you the best of luck in your decision.
Peace.
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