If you compare them to the ones on my car, or another R27, you'll see the shape is a bit off, colour a bit out and it should say 'World Champions 2005&2006' underneath where it says RenaultF1Team. Don't worry about it too much though, but if it bothers you you can get a new pair for a few hundred quid or something!
Does it have stickers on the roof? If it doesn't then that means when the first owner bought the car they chose to delete the roof and door stickers, keeping only the ones on the front and back.