Rangers set up the motion-sensor camera along the Margaret River in May, hoping to record images of crocodiles.
The camera, which is about 10 to 15 centimeters (4 to 6 inches) long and 5 centimeters (2 inches) wide, disappeared soon after and the rangers figured it had fallen into the water.
The rangers recently found out that the device had been found near the Mary River, about 110 kilometers (70 miles) away, ranger Roneil Skeen told the Australian Broadcasting Corp. When they examined the video inside, the real culprit was revealed.
The rangers plan to bolt down their cameras from now on, Skeen said.