He is carrying various items, obviously he has been Christmas shopping. One item is a snow sled. Do you think it is for his kids or Sonny's kids and where would they go sledding in NYC?

Or would a soldier pull the kids around on the sled inside the compund?

If I was posting on the IMDB board, I would say it is a subtle reference to 'Rosebud' in Orson Welle's 'Citizen Kane'. But since I'm not I think it is just a prop to make clear that Tom is innocently shopping when kidnapped by the tactless Sollozzo.