The acceptance process for officials is exactly the same whether the game has been completed or not. The official can still login and accept the game using the Accept option on their Game Schedule. You can also Simulate a user's account (from the Members Directory) to accept a game on their behalf, although, we wouldn't recommend doing this as a regular procedure. Alternatively, you can leave the game unaccepted and just turn on the System Setting that "Allows Unaccepted Games to be included in Payroll Reports"... This is Feature #38 in your System Settings, assuming you have permission to change your System Settings.