At the time of ordering (an all silver model) they could have specified a panel change.
There was nothing to stop that....whatever the customer wanted and was prepared to pay for basically.
Or...they could have had the panels sprayed after/later.....it's not unheard of.
Kate of Wellsmart had her diesel resprayed a semi dark pink metallic , and then later had it resprayed
again to a sort of bronze/gold metallic....(and gun metal gray coloured Monoblock 'A's)
One mustn't forget Roberts ALL metallic green ForFour.....every panel, and the tridion, and all the trim pieces.
(such as dial trims, door handles etc etc....)