From Newsgroup: alt.obituaries

The video linked in the article doesn't show any box work until 4:16, and
even then, I would call it "plunging," or perhaps "skidding," not fitting.

https://www.neatorama.com/2025/09/06/The-World-Will-Always-Remember-Maru/
The World Will Always Remember Maru
Miss Cellania o Saturday, September 6, 2025 at 1:22 PM

Maru, the Japanese cat who loved boxes, has gone to the Rainbow Bridge.

Maru was born in 2007, and soon became internet famous for his antics. He
was a chunky cat with an inscrutable expression who tried to fit into any
box, no matter how small. Here is our first posted video of Maru. People
loved to watch Maru whatever he was doing, from discovering new toys to
walking through the grass. Maru was certified by Guinness World Records
for having the most views for an animal on YouTube in 2017. The video
above is a compilation of Maru's earliest videos from 2008. Maru
celebrated his 18th birthday in May of this year. He was diagnosed with
lung cancer and died this week.
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