I believe patch Tuesday was just today, 9/8. It will be a couple of days before those Microsoft patches (for Sept.) are available in the patch import data received in the Symantec console. The MS patches available to you should reflect whatever has been checked in the "Vendors and Software" section of the MetaData Import Task page.
We run the import nightly (around 2am) and my latest patches show 9/4, as well. This looks normal.
As for missing MS patches...not sure which one that would be. We usually see everything relevant for the products we use and need to patch.