According to the PetVille forum, “a few new items have been added to mystery gifts. In addition to the items already inside, you now have the chance of finding coins or Pet Cash inside!”
So far I’ve earned 4 Pet Cash from Mystery Gift boxes, but nothing popped up to alert me – the extra bucks just showed up in my Pet Cash count at the top of the screen. In other words, don’t expect a “congrats on your new cash” message, cause it’s not coming. Fine by me as long as the deposit goes through ;)
Head over to Facebook and send some Mystery Boxes to your friends from the PetVille free gifts tab.