Stealing credit cards is against the law, just as is stealing peoples' money. They pay him, and never recieve their stuff. That is illegal. It's fraud.
He's also not flying low enough to avoid scrutiny, because here we are, people know about him, 501st members included.
He is stealing money, not in the name of the Legion directly, but selling Star Wars props while being part of a SW community is relevance enough.
No further questions, the defense rests, party at my house