Usopp's Cube Fragment

Found on the wall on the ledge right above the entrance/Save Point. Need to grab it with Luffy’s ability.

This is found on the ground, in the back half of Donut Canyon.

Use Luffy to grapple to the green-tinted cranes until you land on the northeast rocky column. Contains 1x Usopp’s Cube Fragment.

Head down the passageway with Chopper and you will emerge in a room on the other side.

After defeating the Bushy Banana Gator on the lower level, look for the vine in the same room that Luffy can grab onto. This leads to the isolated area in the Upper Level. You will need to use Luffy to grab this Cube Fragment.

Hiding behind the lamp post.

Inside the weapon shop, next to the counter.

On the ground close to the wagon.

You will need to Gum Gum Rocket to the top after turning both cranes.

On the floor after using Gum Gum Rocket through the gap.

Underneath the wreckage of the Sea Train, turn around not to miss it.

Use Chopper to pass through the next small hole, then switch to Luffy and jump up and grab the fragment easily.

To get to this scaffolding, you need to press the button on the machine on the platform towards the upper left corner of the Material Depot. This turns the crane and you can have Luffy grab it to get to the top of the scaffolding. Go to the very bottom and look next to the stairs to find this.

x3 on the cliff opposite the point where Luffy can reach by going to the top.

x2

x3