Well, gender is a social construct but sex can be determined right out of the egg. I can't understand why he was purchased as a male if the snake was not popped or probed. At any rate, a vet will be happy to help with determining sex!
Sounds like you purchased a snake and CONGRATS!!!! We love pictures around here so please feel free!!
What does it mean that you scaled him???
EDIT> Ohhh, duh...putting him on the scale.... d'oh!