I have ordered at least a half dozen items from Buy.com over the past few years. I have recieved all my shipments correctly and in a timely manner each time. Shipping an empty box was probably not intentional...
You should check with the shipping company to see what the package weight was that was shipped to you. If you ordered something that was a few pounds, you should be able to testify that the package should have weighed more than what was actually shipped.
We stood in line at for 1 hour & 45 minutes on Sunday and were #23 & #24 out of 42 at Best Buy in Rochester, MN when they handed out tickets. I would say you would have to wait at least an hour, probably longer to be safe...