score:7
The kicker is the delay, once you pass the airlines reporting deadline, the chances for compensation drop to basically zero. Too easy for folks to start claiming all sorts of non-existant items. Personally I would have been persistent with calls or perhaps gone back to the airport to report the theft.
At this point your best bet is to write a polite letter explaining the situation, include copies of the ticket, boarding passes and purchase receipt. You might get lucky.
But I suppose at this point the two of you have learned the number one rule about baggage when flying .... put nothing of value in checked bags.