The Clue in the Recycling Bin (The Boxcar Children Series #126)

When Mrs. MacGregor introduces the Aldens to the local recycling center, they bring home lots of great stuff, including unused notebooks and fun pinata. Mrs. MacGregor was right, you can find treasure in junk. When a series of break-ins and vandalization hits the center, the Alden kids are there to help solve the mystery!