The first one is at the beginning, in the house You're searching on Haggard's request.
The second one is a bit further. Check out the upper floor of the yellow building with a machine gun emplacement.
Once You take a boat, don't go to Your target. There's a small enemy camp located by the shore on Your right. You'll find one gold crate there.
The fourth box is in the southern part of the town, in which You have to destroy enemy stationary rocket launchers. You'll find it in a building with a HOTEL sign above the entrance. In the picture on left You can see that building... but it's pretty devastated.
The last crate is in the graveyard You reach after helping the tanks. It's in the south-western corner of the graveyard.