Literally just done the one on my mum's K12 about 10 minutes ago. I know the prefacelift K11s didn't have them but was under the belief that all K12s had, are you looking in the right place, Take the glovebox out, stick your head in and it should be a white bit at the very back on your right.
If there's nothing there then maybe it's had a dodgy service or repair job and they've just failed to put one in.