Man fined after 700 frozen and taxidermied animals found on Victorian property
(www.theguardian.com)
The article is condemnatory, but lacks any claim that the animals were killed unlawfully. The absence of such a claim is not proof, of course, but it is conspicuous.
You are correct that nothing in the article explicitly claims "roadkill". Likewise, nothing in the article claims that any of these dead animals were actually harmed.