It looks like when you try to submit a Document set to the Record Center by using the Send To functionality, the document set is stored in the Document Center drop off Library but cannot be routed: indeed, as illustrated here :
Now the Document Set (based on a content type named “Testrecord” is sent to my drop off library: but very strange it is packaged as a .zip file
And moreover, my routing rule doesn’t “route” it as expected; if I take a closer look at the drop off library, a content type named testrecord(Packaged) has been associated with the list
And my file (test.zip), is really associated with this new “Packaged” content type :
That is probably the reason why the Document set is not routed.
Also, I noticed that my Testrecord(Packaged) content type doesn’t show up in the list of content types (in my site settings-Site content Types), the reason is that it is stored in a group called _Hidden, even if the Hidden property of the content type itself was false as illustrated here (I’ve used Sharepoint Manager 2010 to visualize it):
Of course, the group name can be modified (by using Sharepoint Manager),the content type will be visible and can be modified in the Content Organizer rule.
However, I really think this should be fixed –>this is bug and I will report it to Microsoft.