And why would it matter how they got it? Adventurers are glorified executioners and thieves, 9 times out of 10.
Think about it. 'Heroes' and adventurers are basically what you're playing in video games. And in those roles you walk straight into people's houses and rob them. You sift through their drawers and ransack their savings and treasure chests. And you're too strong for them to do anything, so they just act like they don't see you doing it.
Link wanders around smashing people's bushes, grass, and pottery all the time to find (steal) their rupees and life saving healing items they hid away in those areas.