Just an aside; but why would a veterinary number/name matter, really? I am sure that there are keepers out here who have snakes (myself included) that had never needed vet care; just wondering. Especially if someone buys from quality breeders only; they could feasably keep snakes for 10 years and never need vet care; while a newbie could have a snake a week, take it to the vet, and be able to produce a vet number/name, and could have lied to the vet..
That aside, it is good that you;re trying to find a quality home, not just sell them and care about just money, or dump them on a pet store.