I won't get technical, but NPCScan works by doing a check to see if the desired creature you are looking for is in your local cache. That means if you have seen the creature, dead or alive, WoW stores it in the local cache and if it is there upon WoW startup, NPCScan will skip that creature. In order to "hunt" effectively for a specific creature, you must at the very minimum delete the "creaturecache.wdb" file in your WoW cache folder.
There is also an issue of creatures being stored in your cache if it is a hunter pet and you run into it. Hunter pets that are rare mobs look identical to NPCScan so in an event like that, again before you hunt, you need to clear your cache again.
In short, if you have seen the creature once, dead or alive or as a hunter's pet, NPCScan will no longer alert you in the "wild". To use the addon effectively you must routinely delete the aforementioned file.
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