I only hope you opened them at least to look at what is inside.
Just imagine the following scenario - partially just happened to me: I recently got my Sideshow Premium Format 1:4 Stormtrooper statue. It arrived with broken belt (other members got them even worse, with broken legs and damaged armor parts). If I decided to keep it boxed (it has a great art box indeed) and never open it up to verify I would have never seen the damage and get replacement in time.
In 5 years if I'd like to sell it I would advertise as "never opened, mint in box" etc. etc. But in fact it comes with a broken belt and in the end I would get in trouble with the buyer. Busts and statues if displayed well (inside glass cabinets, out of the sunlight, no cigarette smoke etc.) will never have a lower resale value in the future. Their boxes are made in such a way you can open and re-open as many times you want/ you just need to add some tape on some.
But in 5 years a sold out item will never have replacement parts not even at the original producer, if that is still on the market. There are some people waiting for replacement plaques for various props from Master Replicas because they bought MIB, never opened props and they were missing those plaques. Will they get them? NO. Master Replicas doesn't exist anymore. Some of the plaques cost a small fortune on ebay now. If they have opened the boxes back then MR had replaced everything
There is also the materials these high end busts, statues and figures are made of: resin, polystone, plastic (ABS/PVC), rubber and cloth (on some PF's and 1:6 figs). I read a lot about preserving statues and figures, how the paint reacts in time with the box and how figures like Hot Toys Batman, HT Appleseed, Sideshow Captain America statue etc. had badly damaged paint or even bodies because of being kept inside packaging. Check out some SSF threads, interesting and scary reads.
Thus in fact personally I wouldn't buy a rare statue, a figure or even more, a prop or helmet, that hasn't been ever opened up by the seller, to be verified, especially if that item is long sold out (and thus out of replacement parts). I asked all the guys and even shops who sold me various items to see the pics of the items I bought.
Not sure if you saw my deactivated real Sterling SMG modified as Stormtrooper blaster (thus being the most accurate blaster possible beating even the Master Replicas version easily), I asked for pics of it because I wanted to see it, even if it is a piece of metal, a real decomissioned weapon like the one used in SW, and nothing could happen to a lump of metal (except some rust that can be easily fixed - though the pro assembling it added a special coat of protective lacquer inside too).
But when I got my Stormtrooper PF statue I asked Mike from Razor's Edge Collectibles to look at his statue stock because I knew many arrived badly damaged from Sideshow factory. He thanked me for letting him know (he had quite a few damaged indeed and got replacements from SS) and even so I got the small belt broken, because none of us thought that the belt, separately packed in a bubble wrap, could be damaged from factory. I did the same with most of my stuff in my collection. I NEVER buy something with just stock pictures, and without real pics of the item outside the box. It saved me a lot of trouble.