Why would a random Chinese retailer keep such a list or even coordinate with western authorities?
Or wouldn't they take extra 10% cut from CIA for sharing the data?
But that's the point - western authorities can't do anything to shut them down and Chinese ones don't care either. Sending a list of buyers is effort and takes time....so why bother?
I mean obviously we're just speculating, I just mean that a random Chinese website would have no reason to respond to such a request from say an American authority(and it's probably unlikely that anyone would ask, seeing as in a lot of places just owning such a device is not illegal, using it is)
I specifically said dealextreme which isn't anywhere near being a "largest retailer". Also with Alibaba you can just message the seller directly. So I don't see how having foreign agents working at a place like Alibaba would help in the slightest.
Either way, like I said, I would be surprised if any agency was spending any effort tracking this, the devices themselves are often legal to own and the cases of abuses seem rare.