DJI never made a 6000 mAh battery. There were two aftermarket 6000 mAh batteries available in 2015 and 2016. I bought two to see what extra flight time could be expected which wasn't much more than about 5 minutes.
Those batteries are made in China but the Chinese like to copy DJI labels or other products instead of making their own. The serial numbers you posted are from the original DJI batteries for p2's produced back in 2014.