I have had this same thing happen to me. One order I lost track of time and it was actually almost 2 1/2 weeks before I realized I hadn't heard anything. I called and was informed that they had cancelled the order. I had not received notificaiton on it and in fact never received written notification.
That was the longest it took to find out that something was cancelled, but I bet I've had 10-12 orders with them cancelled. Most of the time I get the notification with 4-5 days.
This is just so odd to me. Their customer service in store is second to none! How can one company differ so greatly from online to in-store??