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If you search in Maven Repo Browser and get some search hits, it is not necessarily clear which repo(s) contain these artifacts. The details view does not say, and none of the context menu items help. You would have to manually try browsing beneath each repo.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss