Look in the folder *Library/Audio/Plug Ins/Components* - whatever is in there with the suffix
.component should show up in Logic as plugins, as they are Audio Units (AU), the plugin format Logic uses. Whatever is in your VST folder is not used by Logic, very definetely. _It cannot be used by Logic._ You need a VST-to-AU wrapper like this one:
http://www.fxpansion.com/index.php?page=5
There are not many OS X VST's that don't also have an AU version. You could request Kammerl to also make an AU version.