Well, I had an experience that worked opposite for me. I was given (yup, given) a male ball python early this year. The guy just didn't want a male ball python, so he gave it to me.
Anyways, later someone came by to sex all of my animals, as well as a bunch of friend's animals. That male ball turned out to be a female (Jive). So, it worked great for me
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Even the suspected "male" spotted that I got for valentine's day turned out to be female. I think I ended up with all my females first, then got the male
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But I hope things work out for you so that you end up happy with your guy
TK