How can I find out for sure?
Here's the link to video https://m.youtube.com/watch?v=34j4JisPbZk
The verdict reached in the Russian video you linked was that the aliexpress ones may have had slight differences but were in fact genuine, and the note below the video says that a listening test confirmed they sounded the same as the original ones he had.
Some of the comments below the video say that it's possible they are fakes, and that the uploader should have compared pcbs etc, but I would have thought them sounding the same means that it wouldn't really matter if they were "fake". If you bought yours off a reputable retailer, there shouldn't be an issue.
[EDIT] - Double-checking the aliexpress site that the video links to, the price is basically the same as NZ pricing, but without consumer guarantee etc, so probably are original, but it wouldn't have saved you money buying from aliexpress instead of locally.
Thanks so much for checking that out for me. I take it you speak Russian?
I feel better about it all now. It wasn't so much the money it was more about a NZ retailer flogging counterfeit goods and of course paying for non genuine goods. :)
Sounds like they are fake to me. Most likely assembled from a mix of fake parts and real ones that happened to be surplus.
They may sound just like the real thing because they have real drivers but they may fall apart after six months because of other parts being of poor quality.