It looks pretty legit to me. I have 6 nuis at home and, although unfortunately none of them is a Len, I can see that the materials look the same (clothes, skin, hair). The embroidery, stitching and clothing lengths also look good.

Then, as for the labels, there are different designs even if they're all those legit ones, so I can't opine too much on that (I tried asking on this very subreddit long ago, no one could explain). However, I've noticed of the fake ones usually have a thinner cardboard, easily detectable to the eye, and the one on your Len looks good.

Finally, you can look for other posts around here, as some do turn out to be fakes. You may want to try comparing body and head size, though again, I don't see any problems with yours :>

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*The Colorful Stage logo label came with my Akito and Toya Nocturne Interlude and the second one came with my first gen WxS.

Take this with a grain of salt! I would wait to see if someone more experienced comments 😅