My knowledge is only from at the start of the season, and that the said player was also asked to play the week they defeated Nomads. Unfortunately for Nomads I know the said player I know of didn't play that week, however, that doesn't mean they didn't find others to do so.
The problem though seems to be can it be proved without photo evidence? After all we all know teams will put the names of registered players down rather than the player not registered!
Photo ID for Div 1 up is just as easy as changing Div1 to 3 rounds.