Jv Official as sub

I had one of the JV officials call me about a situation that had happened to him. One of the varsity officials was a no show, so the other varsity official asked him to stay and do the V game. At the begining of the 3rd period the no show official shows. Next dead ball he tell jv guy he's got the rest of the game. Any thoughts on whether commisioner should be told about this or is it between the officials? I don't know if I as the late show guy would have done that.