For a general Munki question, you might have success with these mailing lists:
The Office question has been mentioned several times, but the issue you’re seeing is rooted in the AutoPkg recipe that you used - it’s set to require the base Office 2011 installer (which is reasonable, as the update is not a full installer). If you’ve named your base installer something else, just edit the ‘requires’ key in the 14.6.4 update to your Office 2011 installer. If you’re using MunkiAdmin, right-click on the Office 14.6.4 update, switch to the Requirements tab, then make sure the ‘Requires' and 'Update for’ sections contain packages that are actually in your Munki repo.
It should install normally after that. :)