If you go deeper they have Generations figures that never saw release here like Rhinox listed.
https://www.amazon.com.au/Transforme...dp/B00CP0TMMK/
While it could be some HOz stock that never went to retailers, I think it might be worth considering that some of this is Amazon America stock that is being listed (possibly to bulk up the search results to try to convince people they're now getting the real deal Amazon experience and not what we got when it first launched).