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We would have to assume that every single carcass, including all the bones was completely removed by the devils for that to be true. No roadkills being found etc. And there are a lot of roadkills in Australia. Poo is used to identify species via DNA analysis: https://www.jstor.org/stable/3783732?seq=1#page_scan_tab_con... https://academic.oup.com/jhered/article/96/6/688/2187659

If they still existed we would find evidence in the form of carcasses, bones, poo or kills. I would love it if they did still exist though.