There are more than 4 locations for each part. The smallest one is possible to see it, it's not an error of the creator, but it's very tricky and you can find it in both of the cars located in the center of the map, arround the rocks you have on your right when the game starts, in the opposite corner when the game starts (the one you got in front of you, passing between the bus and the other vehicle, near the clock) and of course on the location you show on the video. For the other parts i'ts the same thing, it will be great to know where every part is located if people comment where they have found the shield.

Anyway, you made a great review of the map, good video man.