Outlook 2013 Shared Mailbox Sent Items Problem

I've only been able to find an answer for this problem for Outlook 2010, and that doesn't work for 2013.

I'm trying to make the sent items for a shared mailbox save to the sent items of that mailbox, not my mailbox.  I got the deleted items to finally work, I just need to get the sent items to work now. 

I've read about this key:

HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Options\Conversations

But I don't have the conversations folder, should I make it?

I've also seen this:

HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Preferences\DelegateSentItemsStyle

But that doesn't seem to work with Office 2013.

Any ideas?

Thanks