Sausage casings from Australia are being used by butchers here in Johannesburg.

Answer

All imported sausage casings are haraam. In fact almost all local sausage casings are also haraam. In Australia, New Zealand and elsewhere, there exists the same problem which we are encountering here in South Africa. Sanha-type carrion-halaalizers in the other countries perform the same haraam function of certifying haraam meats. Abstain from consuming sausages having animal casings unless you are absolutely sure that the casings are halaal.