1. As soon as the mission begins walk out of the house and turn left to go around the house, the memento is on the grass in the back corner of the yard.
2. Once you reach the Bamboo Forest Area, you cross a small bamboo bridge, jump off this bridge and head to the left under an archway and walk up to the small temple which will have the memento to the right of the small temple's door.
3. After you have destroyed the first Android Burrow, you need to head back down the canyon passageway, the memento is between the two forks in the path, the memento is right below a ledge and can be easily missed, if you did miss it, go to the second tree that is knocked over and head back the way you came and you will run right in it.
4. When you enter the town head straight up through the middle of town, you will pass the bar on your left that has an Otsuru Bear on it, from this house turn left after it to go begin it; the memento is at the dead end.
5. The last memento will be on the rocky ledge where the sniper previously stood early in the level, but this memento doesn’t become available until the point where you’re destroying the last Android Burrow, before you actually go into the Burrow.