Haha I just went to a wine page and found that, I don't know, maybe you're more right. But wine can last for a long time, why would it be filtered? perhaps it can be pre-filter or refined before being bottle I don't know.
no idea. most likely Spain, atleast we got quite alot of spanish lines.
and related to my job it's not about countries or quality tbh but about price ;) currently we are expanding our price list to we try to get as much low price segment wines as we can since these types of wines sells better.