The Aussie Bob method would be to make the claim and see if you get away with it. The Tax Office doesn't seem to challenge a heap of stuff. Odds are you will get away with it.
I can see some cringe ... but this is a pilots forum and I am a pilot. You are getting what you pay for.
Oh and by the way, the last person who took the Aussie Bob approach on a different tax issue involving a whole heap of gst was challenged by the tax office. The net result was just a request for the gst back, zero penalty and all done over the phone.