I don't know the whole story, but Michael Moore was a well known person to the melbourne storm I think. and a few years ago while in NZ he tragically passed away. the trohpy as I can understand is something that was brought in as like a memory of him? As I said I don't know the whole story to this. So yeah whenever the Warriors and Storm are playing each other, that little trophy is added insentive I guess.
I guess you could say it's like the ANZAC game every year between the Drags and Roosters