There are many doujinishi that are translated, and do not show the group/person that translated it. When I click on a doujin that has been translated by an unknown person, it takes me to the page where I can download it, and it has a hotlink to the doujins that have unknown translaters. When I click the hotlink, there are multiple titles that haven't been translated, although there are a couple that fit the category. Here is an example.
Follow this link and click on Translation: Unknown. You will see the problem there
P.S. If this is in the wrong section, I'm sorry.