If they have the original plastic on I wouldn't worry much about putting even more plastic over that. I also wouldn't take the original plastic off if you intend to resell at a future date as a brand new item.
Beyond that, one of the best suggestions I've heard (and haven't been able to implement yet) is if you don't wrap opened Steelbooks in covers, simply line your Blu-ray shelf(ves) with some kind of microfiber cloth so that when you slide the Steelbooks off or on the shelf, the bottom edges don't scrape.
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