What does it matter where exactly the JAP PS3's are made?
Their only for sale in Japan and technically there's no difference where your PS3 came from if you only care to play PS3 games on it. Just make sure that when you do update the system that you get the correct firmwares for it.
I have a thing for MADE IN JAPAN label.. I accept the quality with my eye's closed.. how ever my PS3 US model is working perfectly but I wanted to get one for my brother.. if anyone here has a unit please let me know