Buying the toy pickup truck proved to a fortuitous decision. I took the toy to the playground where Tony had been for two hours. I first asked Jenny if she wanted to leave. She said she definitely wanted to, because she was bored after having watched Tony play for two hours. Her saying this made it easy for me to give the toy to Tony there and then. Tony saw the toy, in package, and became very excited. We had no trouble getting him to leave the playground.
And Tony has played with the toy all evening since he got it.
And he then took the toy to bed with him.