I'm not sure of Australian bankruptcy practice, but it might be similar to here in the US. In the US, the trustee will "administer" the assets and distribute funds in accordance with the creditor hierarchy (taxes and employee wages and secured creditors first, then unsecured creditors next, then to owners). I think the folks that put down deposits on cars are in the unsecured creditor bucket which means that secured creditors will have been paid in full prior to any funds going out to you (unfortunately). Usually, unless there are funds to be distributed to you, the trustee won't even contact you after you've filed your forms.
It's fairly typical for the available funds to be insufficient to repay even the secured creditors let alone the unsecured creditors - a real shame. What an unfortunate situation.