Yes, I did call them several times but they said there was no tracking number for my documents.

First time I called, the person said it was processed on July 1st, even though my case status from the website stated, "On July 1, 2013, we mailed the documents to the address we have on file."
Second time I called, the person said it was mailed on July 1st.

So I'm just confused who is right.
I asked if they can tell me which address they sent to, because I moved before I filed the application. And I did change my address prior to applying for advance parole, but I still wanted to check which address they sent to, but they said it was confidential so they couldn't tell me.

I guess I just have to wait..