Select SamAccountName - powershell script

Hi All,

I have written the code below and it will not display the SamAccountName, please help!

get-mailbox -ResultSize Unlimited | Get-MailboxStatistics | where {$_.TotalItemSize -ge "4GB"} | Select-Object @{Name="DisplayName1";Expression={Get-Mailbox $_ | select -ExpandProperty SamAccountName}}, TotalItemSize, ItemCount, Database, TotalDeletedItemSize,DeletedItemCount, LastLoggedOnUserAccount, LastLogonTime, LastLogoffTime

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