Holy crap! We're talking about a battery here, not a computer chip or a machine with moving parts!
Where do you think the OEM batteries come from? I hate to ruin your day, but probably China, Korea, and yes, maybe even Hong Kong.
Honestly, It doesn't matter. I've been using these batteries for years on my various Blackberry phones. ALL of them have performed flawlessly.
You can can get bent up about urban legends about these batteries being terrible, but I am talking about personal real-world experience. They work fine.
If you guys want to spend tons of money on something that doesn't give you anything better, be my guest.
Personally, I think you're being silly.
Knock offs or not, they work - and they come with a nice charger, too.