I have a couple missions I am struggling getting three stars on, and they are all because of the loot score.

Leave the Canyon Before Nightfall: My strategy for this one is to take the northern path to grab the chest on that path, then dip down into the end of the southern path to grab that chest and finish in time. Unfortunately I only get a partial score, and 2 points awarded. I'm not sure where the third chest is, and I'm afraid to look for it because I already barely complete the mission in the time limit.

EDIT: I found the third chest, but it seems impossible to get all three and still make it out in time! Has anyone gotten 3 stars on this, and if so, what is your strategy?

Finally got the other two!

Help on any of these would be greatly appreciated!

Loot score may also include loot dropped by breaking barrels, rock piles, picking up battle loot, etc...

I'm not exactly sure if being maxed on lumber or coins may affect this score, as when you are maxed, you cannot pick up those items when dropped.