After reading and then rereading the OP several times, especially the "replace them right away" part ... sounds frankly as though counterfeits have wiggled into the supply chain and this is all a big hush-hush!!!
An interesting thought, one certainly sees a ton of counterfeit A8 headphones on eBay and such. Perhaps one disadvantage of producing things in China is that someone inside will leak the major design drawings and such to counterfeiters. I've seen instances where the firms making DVDs of movies have had such intellectual property pilfering.
I guess it's one of the many things you have to consider with any production location decision...