Yes, I knew of the "where's my refund" feature on the IRS page.  I was mistaken in that I thought it was only for refunds.  Since my clients owed, I didn't think it would be useful.  I found out that I was wrong.  I asked the client to try using the tracker.  First, he used a negative number for refund amount (third item they ask for), but it turns out that if you owe, you are supposed to put a 1 in the "refund amount" box.  

So, we were able to confirm that the returns were received.  I just wish that the software would give me the correct information: show that it was accepted and give me the electronic tracking number, etc.