surely a zoo in another country away from the bloodlines is fine?
I once had a very interesting conversation with a zookeeper about how they manage bloodlines. Apparently, all zoo animals in Europe are on a database of their bloodlines which is carefully managed. That is how they monitor breeding, and can request an animal from another zoo if they need to mix up their gene pool.
Apparently, no zoo 'owns' any animal, they're technically just loaned among the zoos according to who needs which bloodline etc. Although someone must own them ultimately, so maybe I misunderstood that bit.
So, if this young giraffe was of any value to any other zoo, they would have known about it. Chances are, it was rather inbred and wouldn't be worth trying to breed from. That's my impression anyway.