Spotlight maintains a separate index of SMS messages. I can't remember if the this file comes down on a backup or whether you'll need a more "physical" extraction, but the file (SQLite database, naturally) should be in:
Code::
mobile/Library/Spotlight/com.apple.MobileSMS
You get the message text, and sometimes a date. You don't get a straight phone number, but there's a field which contains identifiers which you might be able to reconcile with the SMS database.
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