Exch 2010 - delete disconnected mailboxes

Mailbox Database1999998113

when I run the below, I get no error which is a good sign, but they are still there...?

C:\Windows\system32>Get-MailboxStatistics -Database “Mailbox Database 1999998113” | where {$_.DisconnectReason -eq "SoftDeleted"} | foreach {Remove-StoreMailbox -Database $_.database -Identity $_.mailboxguid -MailboxState SoftDeleted}

Any thought on how to delete them...?

Tom Karpowski...