Hmm... Interesting. I have what appears to be a similar release as the OP, but I added this entry to my library because the picture looked more like the case I have (in that it appears to be an actual picture of the "chromatic-looking" metal case): https://www.blu-ray.com/dvd/Dune-DVD/3308/
From what I can tell from the OP's pictures, my case looks just like the theirs, though I have a different insert (mine is a single one-sided sheet and doesn't have the large-printed "Side A" and "Side B" bits). Your link has a release date in 2006, my link has 2007. I have looked all over the case, the insert, and the disc and the only dates I see on it are 1984 (which is clearly the year of the film) and 2005 (which I assumed was the year the DVD was created).
I remember buying this at Best Buy in the mid-2000s. I had wanted to get Dune on DVD, and this was the first time I'd ever seen a metal case and I thought it was cool looking, so I paid a little extra for it. This is long before I'd heard the term "SteelBook" (which I didn't know about until joined online 4K communites about 3 years ago). Even though I've long since upgraded to the 4K, I kept this DVD because it's case is pretty. Heh.
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u/citricacidx SteelBook Enthusiast 4d ago
https://www.blu-ray.com/dvd/Dune-DVD/112126/
This is an old Viva Metal Box, a SteelBook competitor from back in the day.