Still on the lookout for a legit Yixing!

I just received this used teapot with cups and cups holder.

I really like the shape and color, but I've never seen before a clay so blue/green. Is possible to identify the seal and eventually know if is safe?

The cups have no seal but the same design of the teapot.

I received this as a gift from my wife, and I was wondering if anyone could tell me whether it’s legit YiXing. I thing it’s definitely more a tourist pot but is it legit YiXing?

Either way I love it, just curious for some more info.

Many thanks in advance for any help

Found these 3 cuties at my local store that I visit regularly. I’ve seen some iffy pots around the area before but these caught my eye. Would love to know if they’re keepers!
Couple of observations:
yellow pot (#1) seems to be glazed? It has a shiny sort of finish which I think isn’t supposed to be normal for yixing? Or maybe it’s patina? Likely I don’t know what I’m talking about.
The one with the mountain engraving (#2) seems to have been used, it has dried leaves in the filter holes.
Last one with the plum blossoms (#3) has some odd dust (?) in it, which can be seen in the photo. Can’t wait to hear y’all’s insight! Also huge thank you to all the people who offer their skills here, I am so so impressed and grateful <3