I'm not sure how widely spread the Canterbury Blues are Munsey? You would need to talk to John Earney (Rare Breeds President) to find that out. He would have more information on the habitat they prefer. You could be right about the Matagauri being more suitable for them to hide in, as their coat is a bluey grey colour, so they'd camouflage nicely.
John's got a small breeding herd of Canterbury Blues. He was selling the meat from the excess males at his Farmers' Market stalls, until the local meat works got bought out by an overseas company and now won't do small butchery lots of meat for the local trade, only export meat. Which means John can't get his meat killed locally, so can't supply his Farmers' Market customers. (He can't get a refund on his very expensive meat seller's licence either). So that's another avenue shut down, for selling heritage breeds meat. If you don't live near an abattoir, getting meat killed legally for the retail market, becomes uneconomical.
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