help needed
Have you tried looking for missing games under User Preferences? I think, if I recall correctly (posting from my phone, so I can't pop up another tab to check) you click User Preferences (top left, under the RPOL logo), then 'Manage My Sticky List' (or something similarly titled). The bottom option that comes up is to look for missing games.
Also, if you recall the GM's RPOL username, you can search for the game using his name, via the Browse/Search Games option on the Main Menu.