1) On the early models the code is painted (sprayed) at the (normally) front right inner wing.
2) Depending on model and year of production the code can be found on the oval plaque only where there are 3 digits in the last line.
When there are 4 digits it's no color code but year of production.
3) Depending on model and year of production the code can be found on the combined rectangular and oval plaque.
4) On my 1985 GTL the paint code is a sticker at the (normally) front right inner wing.
5) And on my 1985 GTL again the color code stamped on a small rectangular plate behind the dashbord attached to the body.
So you can verify that the body (and it's color) is original and came with the chassis (engine bay/inner wings) color, a factory original Renault R4.