Does the subject want to ask "what is the reason for not finding the notice of expiry of substantive examination"? The reasons why the Notice of Expiration of Substantive Examination cannot be found are: it has not been issued, the notice has been returned or lost, and the inquiry system has failed.

1. Not yet issued: The Trademark Office needs to review and sort out after the substantive examination expires, and it may take some time to issue the notice. Therefore, the fact that the notice of expiry of substantive examination cannot be found does not mean that the notice does not exist.

2. The notice was returned or lost: the notice was returned or lost, and the record of the notice could not be found in the query system. In this case, you can consult the Trademark Office or apply for a reissue announcement.

3. Query system failure: query system failure or maintenance leads to inaccurate query results or inability to find relevant records. In this case, you can wait for the system to return to normal before querying.