Sites losted in Sharepoint

i received complaint from user that some Sites losted in SharePoint, can some one please help me how to diagnose the issue.
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Jamie McAllister MVPSharePoint ConsultantCommented:
First off, look in the recycle bin. When my users lose sites, they've often deleted them.

Then check permissions, do they have access.

Then check navigation, have they simply lost the link?

If it's not deleted, lost, or locked then something very odd is going on, and it's time for the ULS logs...

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ELS ELSAuthor Commented:
how to see ULS logs and what are they useful for?
Jamie McAllister MVPSharePoint ConsultantCommented:
ULS Logs are on the servers, however they're difficult to read and you'd have to know exactly when something happened as they are quite verbose. A last resort.

If you have Auditing turned on, that could let you know if a user deleted anything?
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