Board Thread:My Singing Monsters Forum/@comment-25404524-20170831103335/@comment-24577221-20170831180912

My guess is that it will do the same thing as regular Wublins do, but on a much larger scale: a random currency type, and rather a lot of it. Probably with the odds shifted away from diamonds, since BBB doesn't like to hand those out for free.

But that's pure speculation. I suppose it might instead collect all of the currency from the Wublins that are (supposedly) happily living inside it, and present it all at once, whatever the combination of types happens to be. I expect we'll find out in a couple of days when people have managed to activate their Wubboxes.