That is exactly why you never send anyone your scanned passports or degrees online because in China they normally sell the information on the black market, build credit profiles, or yes, use them for the illegal importation of cars that require foreigner credentials. I know of one guy that had his credentials used for the import of a car near Beijing. The car was in a crash and it was still in the foreigner's name when the police tracked him down. If someone wants your credentials, take a digital photo of them at a distance so that they can see that you have them, but they won't be able to use them for any illegal purposes. If they want to see them further, go to their office in person and while you are there, check their licenses, ID cards, etc. A bunch of those passports and degrees are also sold to illegal Chinese in the USA as well.