I was in the same boat, my passport was delivered on July 7th, and I never got any response from them, when I emailed them, they even said they did not receive my packet, I got scared and emailed all the tracking details with the screen shot showing delivered and signed by "M. Garcia", even then they did not acknowledge. I called LA customer service and gave them all the details, they created a ticket and told me they will respond within a few days, then they replied through email that they have high volume of applications and they received it, it was little relaxing then within a few days, I got a tracking number, not the tracking site shows "Passport received at the visa office - under consideration".
Honestly, I don't think it is the best way to update people but what we can do? Once we mail-in the passports, it is all pure luck. All is well that end is well. I would advise waiting for a few days, your turn will come. All the best. If you are near to them, go personally, for me it was far and still I was thinking of going there but luckily I didn't have to.