What is right approach to handling multiple of same product in different conditions (used)?

Few months back I created my own woocommerece website for selling toys and hobby products. Currently my inventory pretty much entirely consist of used/second-hand. Of which I often get multiple of same products in different conditions. How can I list them in way they visitors don’t accidentally stumble onto an out of stock product. Especially when there is another one in stock. And which approch is best for SEO?

[This is my current setup]) . I make them as a variable product and add each piece as a seperate variable. I have seen some people setting individual products as “no-index” while indexing the tag which groups them together?

Which of the 2 approach is better for SEO and is there any other way?

 

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