To assist people with identifying KO vs real giftsets, refer to the below links -

Zhong Jin
Kidi Toys

In the case of the above Ebay auction, you'll notice that the grey boarder surrounding the Devastator box art is absent. This is the Zhong Jin version and the easiest to identify due to this omission. There are also yellow and orange versions as well which are easy to spot because these were not made available as a giftset.

Also be wary of the carded versions.