@HAWK are you still getting the 404s after the July 27 change?
FWIW I did notice similar before, but not because of disabling Badges.
One of my “bad guy” members made a post (back in March) and was granted a First Quote Badge.
After the post was deleted, the Notification and Profile Badge “card” remained.
But clicking on it gave a 404.
Any chance the First Onebox post for that member was deleted?