Distinguish real and fake Tannoy GR series Speakers

I learned that FAKE Tannoy GR series have been made exactly like the real ones in Asia countries (China, Cambodia…) and sell to customers via Ebay or e-comerce websites. Cabinet are real ones (from second hand speakers) but crossovers or drivers… are fake. Tag, labels are made in China and unable to recognize by comsumers. Could you please advise how to distinguish real and fake ones. Is there any 3D code or Barcode to scan and check. I found no warranty stamp affixed on the back of Tannoy GR series speakers.
Thanks