Wouldn't be sure about the carcasses, bones, and kills, not when they share(d) an island with another carnivore that is a very effective and enthusiastic scavenger:

https://en.wikipedia.org/wiki/Tasmanian_devil > Tasmanian devils can eliminate all traces of a carcass of a smaller animal, devouring the bones and fur if desired.

The poo one is interesting - no matter how hard I google, I can't find an image of thylacine shit, so not sure how you'd differentiate it from other animals' scat.