Fuel filler cap colour

[Smellyone]

I have a 2007 c219 in tellur silver paint code 762. A lovely colour in my opinion however there is something that appears out of sorts. I'm sure that the fuel filler cap colour is standard Mercedes silver. My question being would anyone know whether this is factory or a former keeper fit? Thank you

 

[BlackC55]

Any pictures?

 

[Trickythemerc]

Could have been replaced for some reason, just paint it with a rattle can.