"It's just a shame that you've got people stealing stuff like that.
"It's the weirdest thing, you're trying to do something for the community with your lifeguarding, and then somebody goes and takes gear away that's useless for them, but so important to you."
Her custom-made Waterway fins are still missing and so are her mother's camera, phone and handbag.
She hopes her fins will turn up somewhere, and asked members of the public to keep an eye out for them online or at the pools or beach. She would have help from the surf lifesaving community with this, she said.
Macartney said the fins would be useless to anyone else as they were made specifically for her feet and were very uncomfortable.
She has events next month and nationals in October, and will use an old pair until she can afford a new custom-made pair - valued at about $800.