If time permits, GMs and Event Organizers can spend a few minutes reviewing players’ Organized Play records at the start of an event slot. These reviews can happen for a variety of reasons. For example, you might need to learn what a character did in previous adventures, or you might want to verify the records' accuracy.
When you are looking over the players' records, if you notice anything that seems amiss, you can ask the player to explain any potential errors. Remember that errors are far more likely to be honest mistakes than intentional cheating—and that it is possible that they are not errors at all. When you ask the player about a potential error, speak with the player calmly, nicely, and with an open mind. The player might have simply made a mistake—or you might have made a mistake in your understanding of their records.
Remember that the game is supposed to be fun, so waste as little time as possible on drama and spend as much time as possible providing an exciting, action-packed adventure for your players.
Resolve any issues as fairly as possible. For example, if the character selected an option that they did not have Access to, let them pick another option to replace it; if they paid a discounted price for an item in error, let them pay the additional costs to meet the full purchase price; and so on. If you believe a player is cheating, ask your Event Organizer for assistance. If you are both the Event Organizer and the GM, use your discretion on how to proceed.