Actually, bootleg kai figures have been in circulation for a while now. Just do a google search, and you'll find links like these:
https://forums.zero-type.com/viewtopic.php?f=12&t=1950
https://forums.sgclub.com/singapore/how_recognise_bootleg_238328.html
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In my experience, Amazon is just as bad as Ebay, when dealing with 3rd party sellers. I've purchased a few Gundam modeling kits in the past from Amazon, and unexpectedly, they turned out to be bootlegs from a company called "TTHungLi". And when I tried to file a report, Amazon never had the courtesy to get back to me
. Not saying that all 3rd party sellers distribute illegal stuff, but it's always a gamble when dealing with them.