If you mean that last line which includes "ready 697 bytes", the ICID isn't given on that line. Roughly speaking, the ICID is only given on log entries which correspond directly to steps in the SMTP transaction. So the initial connection results in the "New SMTP ICID" log entry and the log entry noting the sender group, the "MAIL FROM" command results in the "Start MID" and "From:" log entries, each "RCPT TO" results in a "To:" entry, and "QUIT" results in the "ICID ### close" entry. Log entries having to do with the contents of the message, such as its subject, message ID, size, anti-spam result, etc., don't correspond directly to steps in the SMTP transaction, so they don't log the ICID.
