438177 may not be the consecutive unit number. Check the first boxes on the upper left corner. Depending on model year, the consecutive unit number may
appear there. By 81 and 82, computerization had progressed to the point where VINs were being assigned before the cars were actually built and they appeared on build sheets.
Do the options and colors listed on the sheet match your car? What about dates? Are most of them close to your time/build code?
Why not gently flatten out your sheet? It would be a heckuva lot easier to rear.