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What's a worm tube? Standing tall at 2 1/2 feet a worm tube is a plastic sewer pipe that's buried in your garden which shelters your worms who eat your compost. The bottom 18 inches have numerous holes that allow for the worms to enter and exit the tube.
Similarly, you may ask, how do you make a worm tube?
PVC pipe can work just fine to create a worm tube. Cut the pipe into sections with a circular saw or hack saw and then drill 1-inch holes into the bottoms of the pipes using a hole saw. Other people have had success with 1/4-inch holes drilled into the main pipe.
Keeping this in consideration, what is a worm tower?
A Worm Tower is basically a length of pipe buried halfway in the ground with holes drilled in the buried part for worms to get in and out. Food scraps are added directly to the tower instead of into your composting bin, and are eaten by worms already living in the target part of your yard.
The worms that work the soil, making tunnels and creating good soil structure, are earthworms, which are not generally (ever?) for sale. So, no, it's not necessary to add worms to raised beds, even if you could find any for sale. Worms will find their way through the cardboard, no problem.