Those cashes may be exactly buries chests. I can assure you, this tool is extremely accurate, as it scans the save game itself, and if the data in the save game is not accurate... What will be, is a good question to ask oneself
It will give you info about artifact, unit, and whatnot in a nutshell (or sort of).
For example, when I scanned my last game just before finishing it, I discovered I missed out on several hidden chests (some containing valuable items)...