I do belive there are cases where people cheats in order to get info about nmy. For example a guy in my team had the exact location of a hidden nmy cv that had been gone for hours w/o anyone from our team been near it. There werent any logical explaination to how that guy could know the pos of the cv.
Given my years in game, I can tell you that when it comes to hiding CVs
1. The maps are only so big....and stumbling across one is common place
2. The chess pieces all seem to hide them in all the same places.......Take the CV to the farthest possible corner of the map and hide it there
( Then the people looking for it can figure out the route to the farthest corner of a map...isnt that difficult from there, expecially when if its your countries cv your looking for. To narrow down what corner its in, 99% of the time its in the corners between the 2 countries that have interest in it...cutting the amount of corners to look in from 4 to 2.)