It looked to initially depart its Sunshine Coast base and fly into Mackay Airport before then departing down to Archerfield. Later, VH-SIY flew up from Archerfield and into Bundaberg Airport.
At the time of writing, it appears that VH-SIY is staying at Bundaberg Airport for at least the night.
UPDATE! Early on Tuesday 1 February, VH-SIY departed Bundaberg Airport for Cairns. It then later returned to Bundy from Cairns before ultimately returning to the Sunshine Coast.
Photo taken by 'AC' ©