One of my friends bought me the Black Mage Chocobo for Christmas once. He's been a sort of mascot for my conservatory ever since (along with a bat who hangs from a tree we call Batman, and a manatee beanie...).
I've just this second taken a few pictures of it to see if it will be any help to you.
Here it is sitting still and behaving very well:
A closer look:
And a look at the label, which I thought would be useful to you:
I'm not sure if this is exactly the same to the one you have, but I can imagine that it is.
Would you be able to take a picture of your chocobos? I'm not sure how you mean when you say lighter than on the website. It might just be an issue of room lighting and posting a staged perfect photograph on their website.
If it has Square-Enix mentioned somewhere on it though I can imagine that it is official.