I understand that an Announcement to the effect that...

I understand that an Announcement to the effect that shareholders will get nothing, and the subsequent delisting of BYL suffices to allow shareholders to claim a loss in their tax submissions. This is what I would have done anyhow, but a BYL shareholder who looked into the matter told me as much some weeks after I opined on the matter.

As an aside, even if one does something that the ATO disallows, it will not impose a fine if the taxpayer has a Reasonable Arguable Position (RAP). Google "Reasonable Arguable Position" and "ATO" to learn what a RAP is.