The cord should have been coiled up, inside the pocket, covered by a clear top sticker not unlike a pre-packaged fruit cup.
The iMac itself has the white cloth outer cover, sealed by the EULA sticker. There is a final, clear wrapper once that is removed.
The accessories kit doesn't have any kind of stickers or seals, but the keyboard has a clear wrapping, and the mouse a white cloth wrapping.
Apple puts a lot of effort into their packaging, and the unboxing experience, so it's very apparent when an item is not in the state in which it left the factory.
That also applies to refurbs, or repair items. After sending my Watch for service, it returned packed in a presentation quality white gift box, with the watch inside a clear wrapper, like a brand new item, despite being a well-worn example with nicks, scratches and all.
Personally, when I buy a new item, I expect any factory seals present to be intact, especially a costly item.
There are some costly items where it's not unusual for them to be unboxed and opened, for examination, but with seals and tags left intact, like a watch. But computers don't belong in that category.
