"The merchants can hand over the money to us."
Translation:Mercatores pecuniam nobis tradere possunt.
For nobis to mean 'our' it needs to be used in something like a dative of possession construction. Pecunia nobis est -> "The money is ours" (more literally 'The money is to us').
Normally to represent 'our' you have to use a form of noster. Mercatores pecuniam nostram nobis tradere possunt. -> 'The merchants can hand over our money to us'.