Here's a thought for ya OP, why not try to get your hands on a couple of dollars (don't need much), and go to the pawnshop with a picture of your parents. Ask if they can show you the items your parents brought in (show them the picture and be like "these people") and ask for one little piece of it just as a souvenir?

You can eventually build another collection, but having the starting piece he from you and your grandpa... That will be the perfect way to start!