not always, they sometimes fall off with moisture.
usually its there, if not, check your handbook, on the delivary sheet it should tell you about what colour it is, and its vin no. etc
sometimes this info is also written down on random pages in the service book.
failing that guess!
who's paint do you intend using to match? most touch up paint dabbers are near enough, just takes a delicate hand.
halfrauds 'custom mixed paint to custom match the colour of your car' doesn't actually match the colour of your car, they are money grabbing theives!!!
if you need paint for your car, there is a few internet bourn companies that do some good stuff.