User cannot see "deleted site collection" event in [Office 365 audit log report].
It seems this feature is not supported yet, but the "deleted" event in [Office 365 audit log report] should be supplied since it is very important information for operation and maintenance for administrators. They feel disadvantage that the "deleted site collection" event is not provided although there is “SiteCollectionCreated” as operation in [Office 365 audit log report]. Please change the design.