The individual log says it couldn't update calendar some calendar entries. How can I identify which users this affected?

Q: Ok so the error log is empty so it didn't have any errors processing mailboxes. But in the individual log for each mailbox that processed, it says that it couldn't update a calendar entry because it had been changed. What can I do to identify those users
A: Also keep in mind the actual filename for the individual users should contain their DNs - as in "MSExTmz-User’s CN from the User DN-Random number.LOG"