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Just to clarify your question, you're trying to find out which nodes publish messages to these topics. This is a different question than asking what their "source packages" are which may be the source of the confusion.
The nodes which publish these topics, if they even exist, would not be a dependency of this package. Dependencies are this libraries and headers required to build and run the executables. The node in this package will build and run quite happily even if these topics are never published, it might not behave as expected but that's a different issue.
As I think you already suspect it's possible that the developers intended to publish to these topics manually using rostopic from the command line or in a launch file. That would be a little unusual but would explain why you can't find a publisher to those topics in the code base.
Have you tried running the node to see what happens?