No, the Metadata Search app cannot search or retrieve private reports created by other users. Reports saved in the "My Personal Reports" folder are private and accessible only to the creator.
This behavior is intentional and aligns with Salesforce's permissions model. The Metadata Search app respects the privacy settings of Salesforce, ensuring that private reports stored in the "My Personal Reports" folder remain restricted to the creator.
Even administrators cannot use the Metadata Search app to search or access private reports from the "My Personal Reports" folder. This restriction ensures that Salesforce's privacy settings are upheld, maintaining data security and user privacy.