Newbie question about ROM

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I'm a newbie having a newbie question:

In my place, some retailer imports O2 XADII from China, which has ROM in Chinese language, then flash the ROM to an English version. After doing that, it claims that the device is imported from Singapore or Hongkong and therefore asks for a higher price. It even puts the chinese deivive into an orgianal box of Singpore/HK one to cheat its customers.

I wonder if there is any (simple and quick) way to identify the the original ROM pre-installed in an XDA?

Your help is very much appreciated.

Thanks