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Without being able to see the site, here are some steps I would recommend taking: 404 all sold products Ensure users must enter unique titles, descriptions, images. Even if they create something similar, these aspects could be unique Show "Similar Products" for all sold pieces Redirecting technically isn't the best practice unless the destination is very similar. As well, this will slow down your site's server response times if done at scale. Allowing them as 200 status codes will create a lot of duplicate content it seems. If you send the site, I could take a further look here!