USAA Full coverage auto insurance covering theft?

USAA Full coverage auto insurance covering theft?

Last night my husband and I were hanging out with some friends and someone broke into all of our vehicles and stole stuff. However, my husband and I drive a 2009 Mitsubishi Lancer and it was locked, yet someone managed to get in without causing any damage whatsoever and stealing our xbox 360. Weird thing is, my purse was in the car with everything in it, and so were the guitars for guitar hero and our entire CD case, and the only thing that was stolen was the xbox…Weird I know. We go through USAA and have full coverage. My question for anybody who knows or has a good guess is, do you think that our insurance would cover that? We don't have a receipt or anything since it was bought so long ago. Thanks for all your answers in advance and remember best answer gets 10 points =]
Happy answering!
Amberly