Same with your chips. I don't care - therefore ebay has a buyers protection.

No it's not the same. I know you're not a hardware person, but here's a quick lesson in spotting obvious fakes (other than the fact that 4164 IC's are unlikely to exist in big numbers in China):
Here's a real KM chip: Note that the notch only goes half way through the IC, that the KM logo is symetrical as it should be (and printed) and the pins are oxidised as you would expect from a 30+ year old chip.
Now look at the chip that the Chinese site is claiming to be a 4164. Through notch (something that was extremely rare at the time), pins that are way too shiny for old stock and a logo that isn't even close to what it should be and is laser etched, something that wasn't possible in the 80's. In fact the logo looks like a mess that someone threw together in mspaint.
I don't give links to sellers if I am not sure that the chips are highly likely to be genuine.
Bryce.