She knew because of vague reports and other background information of scout tendency. These are things not everyone knows. He could have been innocent but he came in bragging about his new shoes. Without any background information, someone could guess he’s really just that successful.He’s a scout who takes things for himself. That job alone means he either jumps in alone before anyone else or with other scouts who’re offscreen. Even then, he’d need to secretly hide his spoils as he’s getting them. He’s got enough of his own plate that he cannot ask others for. Also, it’s been mentioned that his clothes are the only well dressed ones in his team. His entire team is also crapping themselves to get the extra pay associated with a higher rank. He’s the only one loaded in the bunch and GG noted that his gear is too good for the rewards he’s getting. The looting is definitely way above the rewards in cash flow.For a greedy person, money matters more. For his entire team, they want the promotion for more money. Money is what they want.