Out pigs are very unpredictable when it comes to playing with toys. It could sit there for days before they touch it. What I've found helps them get interested in it is to make sure I put their toys in the "bedroom," on the sleeping side of the cage. If it's on the food side, they're much more likely to ignore it.
Once they do decide to play with it, though, they really have at it, and it gets destroyed in a day or two. Like it's supposed to.