Required Characters: Imperial, Jedi/Sith
Canister 1 (Jedi/Sith): When you reach the top level, head left all the way around. Defeat the 4 Imperial Navy Troopers to get this to appear in the air. Jump up to it.
Canister 2 (Jedi/Sith): After heading right, drop all the way back down. Follow the path and Jump over the gap. The Canister sits in the air here.
Canister 3 (Jedi/Sith): From the last Canister, Jump up two levels. It's sitting up here.
Canister 4 (Jedi/Sith): Head all the way around the path and you'll find a gap blocked by Rocks. Force a couple of them to make them blow up. Head past the Rocks to find the Canister.
Canister 5: In the second room, defeat all 4 Imperial Navy Troopers. It'll appear in the upper corner.
Canister 6 (Imperial): In the third room, build the pieces into a Imperial Panel. Use it to make the nearby Emperor Statue blow up. The Canister sits underneath.
To get to the area I classified as Endor Forest 3. Head down from the entrance to the Imperial Bunker and head right. Jump over the gap and drop down.
Canister 7 (Jedi/Sith): Head past the split and continue along. You can Jump up to a higher level here. Jump across a gap up here to find the Canister.
Canister 8 (Jedi/Sith): Head past the bricks you need to destroy to progress and instead head up. Build both the platform and Protocol Panel here. Use the Protocol Panel to make the Canister appear above the Platform.
Canister 9: In the bottom-most corner, where the Bomb for the AT-ST is. You'll find the Canister sitting just further past it.
Canister 10: From the first Bomb you see, head up. Build the Astromech Panel and use it. The Canister will appear close by.
Unlocked Characters: Scout Trooper (6,000)