Whatever happened to Grubber after the events of the MLP Movie?

I am aware of course that there’s a book about him called “The Great Princess Caper”, but...I don’t consider it officially canon because it seemed to lack the magic that made the MLP fan base, particularly because of the way the story played out, and because everything seemed to be too short & obvious.

He seemed to have also just...disappeared after the last scene he was featured in.