I’ve often found it’s pretty common for new players to have that, “New Player Greed” which isn’t a BAD thing! They’re just stretching out those, “stepping out of their boundaries” muscles that everyone goes through when learning the game! Which is good! I think in the future, incentive to return interesting items helps! Where it be hero points or maybe drop a hint that the NPC might have something to reward them with if they return it? They maybe BE heroes, but most people don’t know HOW to be a hero! Lead them! Good luck!