So, I know, what did I expect?
Was just wanting a basic HG40 chain, and the original Shimanos are dirt-cheap wholesale. So I figure it should be possible.
Seller with lots of sales, clearly says "Shimano" and "original", not "Shamino". Photos show authentication sticker on packaging.
And 5-10 working days later, it shows up. The "authentication sticker" is obvious fake, no barcode, not even a duplicate.
Aliexpress have refunded my money. Interesting that the "reason for refund" had no option for fake/counterfeit items :-)
So are there any sellers who can be trusted in China, when they say "genuine original"? I see no official Shimano store.
Aliexpress has been good for many bike parts, just not chains, brake pads, cleats …
Have you tried your local bike shop? I found they can be surprisingly competitive.