Yesterday I did some cleanups and move mailboxes to the new databases I created. I think created Mailbox Copies (More on how to do this:

In the event log I started to receive the following warning:

“RPC request to the Microsoft Exchange Information Store service for log truncation failed for database (DB Name). Error: Failed to notify source server ‘Server Name’ about the local truncation point. Hresult: 0xc8000713. Error: Unable to find the file.”

This warning will clear with the next full backup of the Database and when all the log files are truncated.

Hope it helps