Yeah right, they all mined on the same IP, I'm sure that worked well! A more likely explanation is those settings are already in the firmware image they use to flash the units just before they are shipped out.
I wouldn't think different if miners which i received and i received 5 in one day was with different credentials.
Not same IP plus the fact some was overclocked. So u telling me that bitmain flashing units with firmware and different credentials on each units?
If you really believe none of s1 was used for mining in bitmain factory you must live in strange world.
Price is low for so long and bitmain must compensate that somehow. Most BTC from orders are untuched so where money come from for production?
As i said before i have ONE unit from 2014 batch, rest which is 4 is from 2013. So now, question is if this is just old board which was assembled this year or whole miner which finished work for bitmain?
Please rethink again what was said.