There Is No Such Thing As A Free Box

~While in a large supermarket a few days ago, I noticed a section of the store had been converted into a display for storage containers that were for sale. I realized that there were lots of loose objects sitting around in my apartment, and that perhaps I could use a box or two to put them in. Imagine my delighted surprise when I saw this:

^ Wow, a free box! The Japanese are so generous! As a bonus, the free box even comes with some Japanglish:

Clothing, a tool, a toy, etc
It is arrangement order
shapely finely.
It is the free box
which can be contained
anything freely.

I'm not quite sure what to make of this. The last part of the writing seems to indicate that this "Free Box" is, in fact, some kind of extra-dimensional storage container with theoretically infinite capacity; hence "which can be contained/anything freely". Perhaps this only works if the objects to be contained are arranged correctly in "shapely finely" order?

I was about to grab a few of the free boxes when I noticed that they had attached prices: ¥900 each (about $7.50). That's supposed to be "free"?? I call false advertising! Lies, I tell you, lies! ~Oyasumi.