Escape plan

Two girls have been abandoned… Camille is restrained in a waist chain and Tube mitts, so she can not use her hands. Cassie is restrained in a waist chain and blue box, so she can not reach her key holes! The girls seem totally helpless, but Camille has a key hidden somewhere. But… can they work out a plan to escape all of these restraints? There is a certain logic in it… but they will have to figure it out!