What is it? You don't know.
You just have to take a chance on something cool, but I promise, the value of the art and things inside the box is far greater than what you're spending right now.
I guarantee you will get at least one custom can in the box, plus a bunch of other stuff. I take a medium, flat-rate, USPS shipping box and stuff it full with art, goods, and maybe some snacks (nothing perishable).
Doesn't that sound mysterious and delicious?