Dog owners soon learn that their dogs don't need lots of toys, or expensive chew toys. Mine don't anyway. They're just has happy chasing an empty water bottle around and have just as much fun (if not more) doing it than with their toys. In fact given a choice, they usually go for the plastic bottle instead of all their other toys. Funny, but true.
It's like kids and boxes. Forget the stuff that came in them. They have more fun with the box instead.