The tannery officials visit Rukmani after Raja's death because they are worried that the family might want financial compensation for his death.
Explanation:
When the men visited Rukmani they lied about their reason to be there by telling the story that Raja was caught stealing a calfskin and that the watchmen did not apply severe force on him, and then they tell their true intention which is to make themselves sure that Rukmani will not make any legal claim over his son's death since he caused that to himself after being a criminal.
