He could have asked them to deposit it into his US bank account, it really isn't that hard to do a wire transfer. It doesn't make sense to pay $30 in fees when you are only sending $500, but for $50k its a blip.
For Chinese citizens it isn't easy, but for govt and institutions it is.
If he had started a company on the side (legal) then the Chinese could have bought it (legal) for a fortune. Lesson is, get legal advice!