Well, there russian guide says that any cheating is recorded in the save game, because it records any change in your character's runes, items, money, troops all the time. I don't really know how to open that save game, edit it and discover if someone had cheated, but I'm sure the developers can. This is why it is prudent to provide a save game to show the developers (if not the other players) that you did it without using improper means - like cheats
