I don't remember Arthur Fleck coming from them in another packaging, I'm 98% sure that it was sent as JND sent it. But in saying that the packaging is very secure regardless, I'd recommend youtubing an unboxing video. I don't think they did it for Joker or WW84 but AF came with plastic corners on the box for sure, but every release has a strong corrugated outer box, then it's padded by styrofoam sheets which are pretty thick, then you have the thick card outer packaging of the statue box, and then inside that is very protective styrofoam also. Even if something were to penetrate the box or if it were dropped that definitely would be no damage done to the statue.
In saying that some people's released have come damaged, like a broken foot etc. presumably due to shaking of the box etc. In which case, no amount of packaging can save how they sit in their box. But I think those are far and few between. Regardless, it's very well packaged just by nature,