No Disconnected Mailbox after moved to Exchange 2013

I started moving users from Exchange 2007 to Exchange 2013 which is working fine, but I don't see their old mailbox in the Disconnected mailbox (EMC)? in case I have to reconnect it back (for bad move)
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In case something goes wrong with a mailbox move (and here I refer to inline moves) you will see the mailbox on the source server.

There is no deletion on Exchange 2007 side until the 2013 server confirms that all is fine.

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nourbenAuthor Commented:
When I migrated users from Exchange 2007 to Exchange 2010, I remember seeing the disconnected mailbox in Exchange 2007, why it is not showing now?
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