Collectibles that have generated a lot of interest happen to be linked to childhood memorabilia. Now, many people are finding out toys and items from their youth can be worth a lot of money.

Aunty D had given CeCe a brown, fluffy stuffie more than four years ago, whom she called simply “Bunny.” CeCe insisted on Bunny’s presence: at sleepovers, at sleepaway camp each summer, on camping ...