With the united system, you have to report the incident before the match you attend, and provide evidence etc....
There is no stipulation on which game you receive, but think of it a different way...
If someone reports a ticket as being touted, theres a very high chance its an ST or a membership with future games on it....
So in theory the person who reported it could attend another game on that same persons seat, and the rest of the games on that "card" would go back to general sale
It would make more available for additional sales, not less