if you ask they have to disclose it, its a law i believe. some states only require them to disclose if the repair costs more than $300, but painting a BMW bumper easily exceeds that. plus, most reputable dealers will tell you anyway.
if you want to be sure, find a detailer or autobody in your area and ask them to put a paint depth meter on it. if its not factory the paint on the bumper will be thicker. (at most they will charge you $20 measure the paint, detailer near me will do it for free)
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