@Ilwrath:
Are you sure about that? I remember seeing OS3.1 upgrade kits (roms + OS3.1 floppies) on eBay every once in a while, which were released by Commodore. Boxed, with instructions, and a big C= logo. I think that Commodore only never included the 3.1 roms with new Amigas, but actually did sell them separately as an upgrade, through these mentiones OS3.1 upgrade kits.