Hi @KarmalaRB (and @Michael Mulvaney). We need a little more work from from you!
This is a rabbit lower jaw bone from which fresh (not decomposed) red muscle has been cleaned, with a pellet regurgitated by an owl or a diurnal raptor. Quite a few local birds of prey produce pellets of this size. I expect the bird carried part of a rabbit into the wood shed to feed on it and left you only the jawbone and tufts of fur. A Powerful Owl is unlikely because they are not known to enter buildings. At the opposite extreme, Barn Owls love roosting in buildings. However some wood sheds are quite bright and open so I would not rule out several other species such as Brown Goshawk. To refine the record further, would you like to keep an eye out for what comes and goes into the shed or instal a wildlife camera? Some raptors have 'plucking perches' where they regularly feed, especially in the breeding season, and in that case you sometimes see a number of pellets like this and multiple prey remains, beneath the perch. Records of some species in the ACT are known only from such prey remains.
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