Biodegradable Plates and Corn Cups into compost bin

I am trying something new in a worm bin today, adding biodegradable plates and corn based plastic cups. Some blogs and sites claim that it will take about 180 days to decompose. Some also say the corn based plastic cups will not be eaten by the worms and will just break down without them. I am not completely sure if the worms will speed up the process. Knowing that they speed up composting, I think they will do the same with this stuff.

The plates will probably be o.k. for the worms, and I will make sure they are moist before I put them in the bin. The cups, on the other hand, make me nervous. I don’t trust the plastic. Even if they are corn based, they are still plastic.
I need to record the events! I tend to be a slacker!