Thanks for the info and opinions guys.
I went for a Toyota Approved car from a dealership to have the peace of mind that the car has all parts expected with the trim or at least the absence of something would be pointed out. I have not owned a Toyota Corolla or estate before but based on the pics, reviews and test drive it seemed a really good choice. And it really is a smart 'little' car. Only this piece appears to be missing.
Perhaps I should have watched loads of videos just like TonyHSD, then I would have picked up that it was missing. Anyway, I called the dealership, but the dealer I dealt with was not in - fingers crossed for tomorrow.
And Frosty, I get your point, but i did not put the boot full as it would be at home and check how much of it is visible. The retractable cover was up and I tested that it works. However it just did not occur to me that there would be another piece missing.
As said, fingers crossed for tomorrow with the dealership. At least yesterday evening i found a nearby Corolla TS which has this part and saw in real life.