if it is the original colour, then it should be stamped on one of the firewall plates.
they have everything from trim to g/box, diff and body colour.
might wanna try having a look at them, it should be there.
that will be the original toyota colour, and other paint manufacturers will probably have a different code. if you have the toyota code, any paint mob should be able to match that number with that of their own brand.
hope that helps