Stolen Bracelet?

We sell silly bracelet and rings sets. They cost around $4. Yesterday I saw a teenaged girl walking around the store wearing one of the bracelets. I assumed she had bought it (since she was wearing it so openly) and went back to work. Today one of my co-workers found a package that had been ripped open. The bracelet was missing. I checked the computer and we hadn't sold one recently.

So apparently she ripped open the package, put the bracelet on, walked around the store for a while, and left, presumably wearing the bracelet. She almost certainly stole it. It's possible that she forgot she was wearing it. It's also possible that she took it off and left it somwhere in the store before leaving. But she probably stole it.

I'm not used to thieves openly parading the items they're about to steal around the store! And why bother stealing it? It's four dollars, and she didn't even take the whole set!