First off, these things happen from time to time - I doubt it had anything to do with you. This kind of damage can occur from prying and twisting, but I have also seen it just happen because of a small inclusion / imperfection in the steel itself.
Go ahead and send it in - we might have some ELMAX blades around, but I honestly don't know. We do have lots of brand new S35VN 0550 blades right now.
Include a note with the knife (and include your return address!!) and be specific about what you want. CS will let you know what they can do, and you should get taken care of. Heck, if you were offered a S35VN blde but really wanted ELMAX, I might have one lying around.
Sorry for the trouble.
- Jim