The cache is not at the posted coordinates.
You will need to complete the Adventure Lab "Yass River Walk" to gather information for the final coordinates. The Adventure will take you for a loop walk along the river path and should take you about 30 minutes to complete.
You will need a smart phone with WiFi access at each of the five locations to answer the AL questions. You must answer the questions while at the location (within 30 m of the location). If you answer the question correctly you will be given access to a journal entry where you will find a clue for this mystery cache. When you have completed the five locations of the Adventure, you will have all the information you need to solve the puzzle for this cache.
S34 50. (E-D) (A+E) (D+D)
E148 54. (C-E) B E