Its not that suprising considering that the manufacturers do indeed care about the quality of their product, since producing and then selling a large batch of bad product would probably put them out of buisness.
I doubt there's much traceability back to the cooker. There's likely several layers of "cut out" between the cooker and the consumer. Most in the supply chain also likely don't know who the maker was. Of course that's an excellent argument for not taking the stuff, be it meth or shine from an unknown source (if you know the source of the 'shine, you can judge for yourself).