Odd door color

#1
I was inspecting a white 2010 corolla for purchase and the rear driver door is a slightly different shade of white, more like eggshell or cream. The driver denies any crashes or replacement and the door does have the factory vin sticker. Im not sure if this is some sort of factory error in which the door didnt get colored or clear coat or if the owner isnt being honest. Ideas?
 
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