Pretty much every single N900 a person is likely to come across was made in Korea. The process of "remanufacturing" necessitates a new sticker is made for the body so the IMEI number on the phone motherboard and IMEI on the body match. In their infinite wisdom the remanufacturers will state the phone was "made in Finland" instead of Korea. It's an easy way to spot them.

You can expect a poorer quality:
Touchscreen.
LCD?
Plastics sometimes.
Rear metal screen slider "dexigned in Finland".
Keyboard. Alphanumerics rub off in short order.
Bezel will almost certainly have stripped and broken screw thread.
I got an outwardly excellent but inwardly rubbish fake Nokia branded charger with one I bought.