As cool as those are, they are definitely more in the vain of "Hawaiian mall ninja type stuff." They look a bit more like Fijian war clubs, which can sometimes be a lot more intricate and take forms very similar to the bottom one in the photo. So while I am not an expert in ancient Pacific weaponry, I would definitely that as a Fijian influenced production.

One of the biggest things thats a bit off on them is that the cutting edges of war clubs in Hawaii were often lined with shark's teeth and usually rounded so that the teeth extend up from the grip go around end of the club and run back down the other side. Otherwise combat in Hawaii usually involved short or long spears and slings. Close combat often came down to daggers rather than clubs.

That said, don't feel bad about buying it, it is cool and artifacts like it have been sold in the Pacific since the 19th century when islanders began crafting tools and goods to meet the expectations of European sailors who wanted goods to buy and take home. There was an entire cottage industry among the Fijians of selling 'cannibal forks,' often with a story about how it was the last one ever really used (they still sell these, but not usually with the story any more), but the good itself is far more a product of expectation than reality

Here is a photo of two of the "war clubs." https://imgur.com/b4wa1pr