441 is the assembly line job number for your car. It may match the last three digits of your VIN. I am not familiar with the white label. Where is it located? It may have been used if your car was selected for a quality audit.
As Mike indicated...this is the job number when the body panels were being built and prior to the assignment of the VIN tag. If you have a buildsheet, you'll probably find 441 in the upper left-hand corner as a part of the schedule information. The number was assigned to track all the body panels as they were being built that would eventually become the body assembly of your vehicle. It is not uncommon to find the same number on several panels.
For more information, follow this link, and about half way down the page you'll see a link to Job Numbers & Body Panels. Its an excerpt from Chapter 3 that discusses the topic thoroughly.