Wow that is deep! and one of the reasons I hate probing corns. I am a Boa guy normally and boas are easy to probe. Corns are much more fragile and it is easy to pop through the hemi-penis track when probing to go to deep, which is my guess of what you did. Some one had mentioned about a rub method of rubing down the base of the tail and feeling for a bump? If the bump is there it is a male if no bump a female, I might go with that this season, but honestly I stopped sexing my corns because I was so bad at it. I haven't ever missed on a boa, but can't get a corn right to save my life LOL. You would think that even on a pure guess I would get it right half the time! Now I pick out the ones I want and keep them on looks a lone, wait for them to become yearling and then cull what I do not need.
The snake should be fine and should heal with out much problems.
Good luck
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Jim Hopkins "Hoppy"
Hopkins Holesale Herps
Hopfam1@aol.com