I don't know how legitimate customs would take a Carfax or AutoCheck, but those two usually list where the car was first registered.
I think the build sheet of your car also states which dealership the car was delivered to. At least, that is what I recall from looking on my old E39 M5. It may not have been a "build" sheet, but it was a printout showing the MSRP, options, dealer that took delivery, and warranty work on my car. __________________ 
2000 M5 -> 1996 318ti -> 1997 328i 
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