there are hundreds of scenarios that could explain a delay at the plant and/or a delay covering the completed sale of an automobile

the dealership could've claimed the car was "SOLD" even though they just wanted it for inventory
after a car was "scheduled" a delay could've been due to parts shortages
this delay could've caused a potential customer to purchase another vehicle on hand at the dealership
a dealership's finances could've contributed to the delay
etc.
etc.

what are you using to determine the car was built a few weeks after the SPD?