Adding a little compost from the full box can help encourage the worms to move. Once the worms have migrated out of the box you can empty the compost onto your garden. 'Worm tea' fertiliser liquid ...

You can build a DIY worm farm that will produce ... @zabeenl offered a more natural worm farm approach, "Trying to create a "worm farm" in a cardboard box on the urban forest floor ...