Irony of Willy Wonka prop thief

I was reading about the famous (but revoltingly named) Veruca Salt from the original Willy Wonka movie, or rather about the actress who played that character (Julie Dawn Cole, now 51), and she mentioned that she still has some memorabilia from the film.

After Willy Wonka and the Chocolate Factory finished filming, she kept her Everlasting Gobstopper and Wonka Golden Ticket props even though she was told to return them.

Hmm, I wonder where she got that idea? (Well, it's only the whole point of the movie!) And could even Old Slugworth get it out of her at this stage?