"Yamato Unyu" is one of the largest courier companies in Japan. Their black cat logo is very well recognized in Japan.

They recently started a service called "Compact Courier", in which the company provides a proprietary box especially for smaller items.

And I guess they thought - "hey why don't we get a black cat to assemble the box for the commercial?"

And so they did:

Shooting apparently was more challenging than they initially thought - it was basically up to the cat to do whatever she wanted with the box. So they had to wait until the cat takes the action the film crew wanted.

Glad the video turned out to be quite adorable!