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As others have mentioned, the VIN would be the definitive source. Use the online VIN decoder, or call it into the dealer.
Also, you may be able to tell by the model year of the car. I believe Interlagos was an early M3 color in 2008-09. LeMans blue was then an option after that replacing Interlagos. Any early model LeMans or late model Interlagos is very rare and would indicate a custom color order.
Someone correct me if I'm wrong.
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