There is no way to know what orders have the CDRW drive on them.
However, I did a little checking of my own, and it seems to me that almost all orders before WB49559 now show shipped or cancelled.
That's about 50 short of my order, and there are alot of "Back Ordered" status after WB49559. Most the orders around mine show Back Ordered, so I assume that the few orders that show shipped where for something else. I looked at the order times around mine and it looks like the orders where coming in at about 5 per minute at 1:00 am I'm sure most of them are the CDRW's since they are back ordered.