I'm not sure but I am going to guess people got them from either a) being devs or beta testers (seems unlikely given the numbers) b) from combining 3 ships in the forge (seems more likely)
Reason I say that is I have a ship that's technically not a buyable option called a Crimson Chaos which is a variant of the Spear of Polaris style ship.
But in other news, they seem to have played with the pvp scan algorithm. I only get level 25 and 24 ships now. Good they are balancing it, annoying since now I sometimes get no results again.
And if I combine 3 greens in the forge to get another god damn green I'm going to rage.