In response to the original question, I wouldn't let the kids play with any of it.
Dont loose the accessories, and if you want to know whats what, spread the weapons out on a bit of paper and write numbers next to each. We can then tell you what goes with what if you want to pair them all up.
And your cardboard has a bit of value, as mark said, particularly the hammerhead so don't go bending them or throwing them away.