I was sailing with 3 others at the popular spot near the runway (cooks river bridge). I had my fin and screw driver along the fence line to try different fins. I came back to shore to find them all missing. Many windsurfers leave fins etc at the same spot to do the same. I won't be doing that again and suggest you think twice. It's also a worry that masts, sails boards left in ute trays, roof racks can easily disappear, though they are harder to take without getting noticed.
In case any one spots it, it was a MB Fins 44 Freeride Powerbox with cover and JP Australia large phillips screw driver with black handle.
Surprising a common thief would steal a windsurfing fin as they are pretty well useless for anyone besides a windsurfer. Best to keep an eye out on Gumtree and eBay to see if someone tries to offload it.
There's a lot of three headed people around the four shore l keep everything locked in my truck. Back in the day l would have two boards sitting on the shoreline & a sail fully rigged. Ashame this is happening.