This guide should help you:
KA366615 - BBSA Windows Patch Troubleshooting: Windows Hotfix Patch is not found in the Catalog
Also I hope you will find these handy as well:
KA363243 - BBSA Windows Patch Troubleshooting: Analysis Job reports an unexpected patch as Missing
KA366513 - BBSA Windows Patch Troubleshooting: Analysis Job does not report Missing expected patch
KA325243 - BBSA Windows Patch Troubleshooting: Analysis Job Results conflict with 3rd-party Vendors
So from the KB article in our case the options are:
1) Missing Filter - because we are typically not going to have any idea what a given patch does (all we get is a KB article # from another team in most cases) we want to just include every filter and let the smartgroups sort it out. I have checked over the list of filters a number of times but the UI doesn't make it easy - I have checked it enough times that I believe I have included every potential filter but is there an easy way to verify that?
2) "Private" MS Patch - If it has a KB article can it be a "private" patch? Is there any way to differentiate these?
3) Shavlik doesn't support it - This is not a new patch so subscribing to a list of newly released patches isn't going to help. Is there a (readable) list of supported patches somewhere?
Other teams in our organization tacitly assume that if its something Microsoft has released that we will be able to patch it and I'd like to understand what I can tell them differentiates certain Microsoft patches for which this is not true from others.
Looks like 2)
In that page you have "View and request hotfix downloads"
THis is not a typical patch that's released by MS to the public, therefore Shavlik does not include it in their XML release.
Also keep in mind that Shavlik in many ways is a superior patch analysis engine to even Microsoft's own internal patch analysis. I have seen many times where Shavlik detected superceded patches and Microsoft didn't catch them and wanted you to install outdated patches first. If you get a chance to compare WSUS analysis results vs Shavlik's analysis results, you will be surprised.