Did they have other snakes? I am guessing no.So he is probably guessing still.If you can get a pic of the vent area back to the tail we might be able to give you a 80% on the sexing.If you are not going to breed it then if you are wondering for a name it will never know the differance
I kept my breeders in 20gl longs and they had plently of room to move around in.