I create a lot of games and activities with pieces or cards. Usually it’s just a piece of colored paper laminated, cut into several pieces, and stored in a ziploc baggie. But inevitably, at the end of the day, there are always some pieces that wind up on the floor and you have no idea which bag they came from. To solve this problem, I have begun numbering the pieces on the back.
Here are some puzzle sentences I use with my students that I use this trick with!