Download your organization's setup audit trail and search, 'Deleted sandbox' in the file's Action column.
If any sandboxes were deleted in the last 180 days, the action column should contain the following details:
Deleted sandbox, name: <SandboxNameHere>, sandboxid: <SandboxSetupPageIdHere>, sandboxOrgId: <SandboxOrgIdHere>, deleted by: <UserIdForWhoDeletedHere>
Review the Date column for the entry to see exactly when the sandbox was deleted.
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