I totally missed that when I saw that image the other day, good catch.THAT EGG CRATE LOOKS LIKE STYROFOAM. The crix will chew it and pass it to your cham so dispose immediately.
I too would add more stuff for them to hide in but you should be able to keep a lot in there! They're going to need more ventilation though or they'll start dying from high humidity, and they will stink if they're that enclosed. I would cut out one of the sides or the top and hot glue screen over the hole and that will help tremendously.
I have two sides and the top screened so there's good airflow through one side and out the other. I think that's better because you have air moving from top to bottom. Maybe you should try a different cricket vendor if they all keep dying.i have the entire top screen on mine, and they still die fast and stink horrid.