Other ragonaroks don't have a problem telling when bots transfer things. I don't see why this one can't know it either.
It's not problematic to tell when you're looking at it ingame. The problem is -> our GMs don't act/work ingame, they work on tickets. Trying to solve ingame problematics (like zeny sellers, botters, exploited bugs, modded exes etc) just by judging from a couple pictures doesn't work when you don't know what you're looking at.
You could compare it to some mod in e-sport leagues who's not playing professional himself. They often judge situations/games by what they directly see on screen, not what's happening around it on the rest of the map. They just lack knowledge and experience to get whats happening, and when you see some screenshot from one player with tons of highlvl players (most of them being rogues) on a low-lvl map, you should get that something is fishy. And then you should look at the whole map, not just at a screenshot.