Using the API, I have compiled a list of teams that are listed as appearing in no issues. This is the first of many reports I'll be generating on a semi-regular basis for Comic Vine, having generated four reports for Giant Bomb previously. I'll release the code for these reports when I'm reasonably confident that it can safely be used by others without causing world destruction.
 
Please take a look a look at the list and see if you can help out. Some simply need to have the appropriate issues attached, but some may need to be deleted.

Teams appearing in 0 issues