I'm not attempting to beat your hopes down, but I've never had any luck with USPS and their "customer service". I've both called and emailed them concerning mail that was missing and all they ever did was give me a random call saying that they were "looking into the problem", and then I never heard from them again. Emailing did jack squat.

Now I'm slightly more worried about the books I ordered that still haven't updated since being accepted into the system on the 16th, but I figured that I still have a couple of days before it's past the typical 2-9 business days they claim it takes for parcel post/media mail.