I am not a breeder but when I buy a snake I have asked for paperwork. I expect the 'code' the breeder used the hatch date, health records (feedings <what and how often> sheds any other relevant information) perhaps the dam and sire type and any other records they may have kept. I was given the 'feeding card' and the maintenance notes they kept (sheds and poops) as well as a 'birth certificate' Nothing complex but I keep meticulous records and adding information to those records can't hurt if there is a problem.
Hosted on Fotki