mistakes happen nobody is perfect. I had bought a 1300 gram male from a local breeder which turned out to be a 1300 gram female. It sucks but now i have another het pied female to put with my pied male once he has grown a bit. lol. Deff triple check before hand if u can. Its one of those things that will happen at some point or another if you dont check yourself or have someone on hand that can actually sex the snake. Just like we have to deal with males and females off feed in the winter this is one of things we have to deal with as well.