I originally purchased MW2 from an online retailer and received the US copy, when it came to downloading the map packs(DLC) it said in the playstation store that the DLC had to match the BLES-XXX code on the spine on your game case.
The US version was not in the NZ playstation store and so I had to download it from a US account I made.
Is this still the case? 1-day have assured me that it is not but I am still a little sceptical.
Im not purchasing the game from 1-day myself anyway but would hate other people to do so and not be able to get the DLC.