Despite its name, our DIY Object Permanence Box wasn't going to be permanent and when that gave out after being loved much by my then 10-month-old, we got this Imbucare Box with Knitted Ball and Drawer (If you're from the Philippines, I can also help you get your own Imbucare Boxes and other Montessori materials through my efforts via The M.O.M. Store).
Put the knitted ball inside through the hole.
Open the drawer.
And take the ball back out.
Such a perfect fine motor activity!
Although some days it gets used for some gross motor exercise as well!