I beleive most of the fakes are things like accessories, like Bluetooth devices, cell batteries, audio cables, not electronics. If you go to a local flea market you will see the type of fakes that are made. it think it would be too time consuming to fabricate the chasis to make a product which could fool the consumer.
I was sold a Motorola bluetooth piece which I later found was fake. it looked very real, the only giveaway was the rather staticy sound and they mis-spelled the word "Motorolo" in the manual, and word "potent" /patent on the package.
I have purchased a set of fake Dynaudio car speakers off ebay which looked perfect and actually sound excellent. The installer was a Dynaudio dealer and he could not tell the difference.