1. Once you arrive at the dam, go up the stairs towards the first control panel. 
Look across the dam to see a similar structure directly opposite. The briefcase is there.

2. Once you arrive at the village, co-op snipe the two guards, and take the right 
path. At the first house you can enter on the path, head to the second floor to get 
the briefcase.

3. After the only back-to-back sequence in China, do not enter the factory. Search 
outside near the back of the factory (it is behind a dump) to find the briefcase.