My Grandma did this one year for us grandkids on Christmas Eve. It was so much fun. We got antique train cases - I now keep my most precious items in it, including some of the papers that had clues on it. She also in subsequent years would give us all riddles and whoever got the answer first won a small prize - mine was a box of cheap ornaments that I will never get rid of. I was privileged and we were not hurting for money, but those experiences will always stand out the most to me.