RC,
My car was built on Monday, March 23rd, and it is still sitting at Bowling Green awaiting to be assigned a carrier for transport. Carriers are assigned by regions, and they continue to stack up cars for a given region until they have enough to fill the truck. This can happen quickly or this can take a while, depending on the region that the cars are destined for. This assignment process helps to ensure carriers leave Bowling Green with a full load.
Unfortunately, Chevrolet has just adopted a policy where they will no longer provide event codes directly to buyers. All they will tell you is, "Yeah, the car is still here" or "Yeah, your car has shipped." Other than that, Chevrolet's customer service continues to degrade.
If you want to know the actual event codes to track your car throughout the entire build / shipping process, your only option is to contact your dealer directly and request it.