When Su Xin took out a Divine Martial Order, both Lord Ksitigarbha and Yama Heavenly Son were stunned for a moment, clearly not expecting that Su Xin had already obtained a Divine Martial Order.
Su Xin did not conceal anything, directly telling Lord Ksitigarbha of his ambush on the White Lotus Holy Mother and the gifting of a Divine Martial Order to Meng Jingxian.
Of course, neither Lord Ksitigarbha nor Yama Heavenly Son bore any grudge against Su Xin for giving the extra Divine Martial Order to Meng Jingxian instead of them.
The Netherworld was just an organization, not a sect; you would get as much as you gave, and if you did not want to give, the Netherworld would absolutely not force you.
If it had been a martial artist from another sect who obtained two Divine Martial Orders, they definitively needed to turn in the extra one to their sect, but such rules did not exist in the Netherworld.