Want to delete (60) Disconnected mailboxes in 2010

We have moved over 60 mailboxes in exchange 2010 to another mailbox database. The original mailboxdatabase now has over 60 disconnected mailboxes.  We want to delete the mailboxes now and not wait for retention period to pass.  We are on exchange 2010. I don't know the proper powershell syntax to delete these Disconnected mailboxes.  an example of a script would be very appreicated

thank you