Didn't realize mechanics had anything to do with ability to see hidden caches. Was able to find it once I raised my mechanics skill from 9 to 10. So needs a 10 in mechanics. Thanks for the help.
It's supposedly in level 10 of Endless Paths in the southeast corner. I've used stealth mode and scouted the entire map, but it doesn't seem to be there. Anyone know where it is? I've looked everywhere in level 10, so I know it's not there.