IDOC mail submission not appearing?

I snail mailed my IDOC stuff to the College Board on like February 16th and they’re not popping up. They haven’t been processed. I emailed them about this and they haven’t gotten back to me. I’m worried that something happened with my documents and they were never received. With my SSN being all over them, this prospect makes me feel rather uneasy. Is there anything I can do?