Yes, there are only three Collared peccary left in the region (all at Melbourne). They’re the remnants of a highly inbred population descended from the import of a single pair in 1969. They can’t be imported due to the risk to the agricultural industry.
It's unfortunate imports restrict this as Melbourne has always shown great initiative with attempting to breed this species. If imports from overseas were allowed, I wouldn't be surprised if Melbourne were continuing to maintain a breeding population and other zoos such as Adelaide joining in with displaying them.