Unfortunately, it didn't. It was missing one leg, the chain was damaged and the raised hand was entirely gone. So I did a few alterations.
I was going to provide a detailed work-in-progress shot, but unfortunately it came out blurry. So here's a very rough idea of how much of this model has been added - two limbs and a shield, basically, both from plastic chaos models.
Then he got some paint. I also added a dagger from an Empire model, because his side looked rather "empty" and Mordheim was always big on twiddly details.
The second chaos knight was only missing his shield arm. I gave him a shield from a modern plastic chaos warrior, which comes with a hand and forearm. It was just a matter of filling the gap and sculpting it a bit.
He was painted to fit in with his friend. Inevitably, he got a little black-and-white chequered bit, which seems to be obligatory on old-school chaos miniatures. The two of them will fit in with the other chaos models for a Mordheim/Frostgrave team. On to the next miniatures!