My wife purchased this Christmas train set from a secondary retailer and gave me the "mission" of assembling it prior to Thanksgiving (to surprise my small grandson). 

The assembly was easy and straight forward, but I have two questions:
1.  Where does the accompanying Santa and his gift bag go?
2.  Can you explain more about those extra couplers that I received? I am not exactly sure what they are for.

This train is really a fantastic addition to our Christmas decoration.   Beautiful!

Thanks.