Some additional info--if you search through Shawn's posts, you'll find tons of mapping information including a lot of details on the zip code mismatches.
ZIPs Match! (mostly)... (this is related to the Beta 8.2 release)
Here's a collection:
There's another more complete one I just can't find. Oh well,
Your first link is showing me an error! "Access to this place or content is restricted. "
Can you fix this please