You can find WRP placed objects.
Here is how it is done.
Of course you have to modify the function: replace all the road object names in the first line with the names of the objects you're looking for (uppercase!). Then you should rename some of the variables and remove/change the misleading comments (optional but recommended). Remove the two lines containing "fn_nearRoads". Save it as "nearFences.sqf" and call it with:
fenceList = [getPos player, 50] execVM "nearFences.sqf";
The 50 is the radius in meters. You will get an error is this value is higher than 100.
I think these are the objects your looking for (not sure if all of them are used on Sarahni):
pletivo_wired.p3d
pletivo_wired_army.p3d
pletivo_wired_branaL.p3d
pletivo_wired_branaL_civil.p3d
pletivo_wired_branaP.p3d
pletivo_wired_hole.p3d
pletivo_wired_slope.p3d