Their logs stored for weapons purchases are separate from those that show the inventory. When they search the logs they will not find anything out of the norm. What they will need to do is compare each persons individual log of what the purchased and compare said log to that of the persons ingame inventory, that is the only way for them to catch you. They will only monitor you if you get a certain amount of reports against you.
Aeria banned my friend account because he had a 4.2 S/D. He was legit, they banned him one day after he purchased 50 bucks in gcoin. Taking their asses to court, but basically Aeria is complete shit compared to IJJI. Fuck Aeria.