Also, Nissan put stickers on the underside of the bonnet - mine is a 313, and it has a black one about the refrigerant in the a/c, and another white one with a Nissan hologram and the VIN number on it. The top edge of the bumper also has the hologram/VIN sticker, as do both of the door shut areas and the underside of the bootlid.
If these are present, it is very unlikely (but not impossible) that it has been repaired and the repairer replaced the stickers...