The mp3's are encrypted, it just uses the key to decrypt and play, if the key is wrong and the decrypt fails it just ignores the mp3, no client side checks that we are aware of and no way to determine the keys from client side that we have found. The only other way to get the keys would be to determine the encryption used and then brute force it, but as it is a int64 (2 int32) key it would take forever to determine the key.

Well this is not a huge ordeal either way. I am running around towns hailing every NPC as I do each zone. I am trying to get logs of all of the conversation possibilities.

I finally figured this out. I was able to pull all of the information I needed from old packet collects.