Where are sms messages located?

[EMSguy]

Ok so, basic situation. I had this really important texting conversation. The new rom I tried out deleted all my texts. I have a nandroid backup that includes those texts. How can I find that file?

Edit: I'm on call right now, and need my phone to call in if there's a call, so I can't simply do a nandroid restore until way later, and I'd prefer not to if I don't have to.