So first, are the video files on the DVDs for the Madman distribution of the set PAL conversions (whether sped up or interpolated down) or the original NTSC video? Region alone doesn't always necessarily tell us this, there are NTSC R4 DVDs out there. Information on what you find in the stores right now most valuable.
Second, as far as Funimation's own version of the same set in North America (which's definitely NTSC), I'd like to know which package came first:
the two 'Green Bricks' seasons sheathed together by a single O-ring slipcover,

[EDIT: ISBN is 1-4210-2456-X & UPC is 704400048777]
or this book-esque design sheathed by a five-sided box a lá a box set.

[EDIT: ISBN is 1-4210-1811-X & UPC is 704400048760]
Both variants are on eBay, as well as what I know to be the newest fatpack clamshell case design which's still available new in stores. However, the manufacturing chronology would be interesting to try confirm, despite their content – I assume(?) – remaining the same between these various different presumably cost-cutting changes in packaging.
Thank you for reading!