1. Ask the county magistrate or the county magistrate's secretary or office if the county magistrate has other instructions or authorizes others to sign documents.

2. If you can't find the county magistrate or his secretary, you can try to get the information of the county magistrate or other officials responsible for signing documents through other channels, such as contacting the county party committee office or other relevant departments of the county government to determine whether other officials can sign documents.

3. If you can't contact the county magistrate or other relevant officials, you can ask the county party committee or the county government whether you can delay the signing of the document to wait for the appearance of the county magistrate or other relevant officials.

4. If the document must be signed immediately, you can ask the county party committee or the county government whether it can arrange other suitable officials to sign the document instead of the county magistrate, and then submit the document to the county magistrate or other relevant officials for confirmation.

5. If the above measures are not feasible, you can ask the county party committee or the county government whether you can submit the documents to the higher government organs or other relevant departments for approval and signing.

In short, if the county magistrate or other relevant officials cannot be found, appropriate measures should be taken as far as possible to solve the problem and ensure the legality and compliance of the documents.