Throughout the boy's journey on the island, he'll come across some toys left behind for mysterious reasons, ranging from a simple fox to a complex windchime in the shape of a Sentinel. These have little bearing except for the end, but in order to find out their meaning, you must first collect them. There are seven in all and span across four chapters. Courtesy of Somewhat Awesome Games, there is a video that shows you where they are located at in the chapters with some topographical assistance. I have also taken the liberty of time-stamping the boundaries in which each toy should be visible and relevant to your interest in finding them.
Chapter 1:Fox: 0:06 - 1:00
Seagull: 1:02 - 2:16
Boar: 2:18 - 2:59
Chapter 2:Pinwheel: 3:02 - 3:26
Bird: 3:36 - 4:07
Chapter 3:Sentinel Wind-chime: 4:11 - 5:22
Chapter 4:Boat: 5:29 - 6:37