We know that ps2 was heavily imported for many countries that didn't have an official realese, 50 million consoles in NA, but here in Brazil we have 8 million of ps2 and i can say that most of it was imported from US. 360 are officially represented in many countries of south america and even with high piracy rate we should import a huge amount of software mainly for ps3 that have piracy no and ps2 thanks for the huge userbase. The question is, how many software and hardware sold in NA are really at NA?

I don't think there exists a valid metric to quantify how many US consoles are exported to other countries.

On the flip side, there exists very many consoles in the US that are imported from Japan. How may total and does it offset the exported units? No way of knowing.