Similar thing happened to me when I ordered new a 2006 E90 330i. The rear door had been repainted in the port prior to it getting to the dealer. Car was silver and the paint match from the port was bad. I should not have accepted the car once we noticed the repair a couple weeks after purchase. It bothered me until the day i sold it. However, if it was the bumper, I would think a pro could match the paint and the repair could go unnoticed. Good luck.
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