I had bought one n900 from such chinese seller from ebay in 2013 and the price was right, listed as new and was made in finland too as seen from the posted pictures on ebay.When i received it, the box was not original but phone looked new.I used it for few days and i thought of comparing by disassembling it too my original n900 which i had bought from nokia usa, and it turned out the parts where just refurbished, even the digitizer and lcd where not original.I just have that phone as a back up now and using my oringial one even today with usb port intact.

I hope your situation is not same and you got a legit one.But now a days even on amazon, the products are just coming from chinese sellers.