Another option would be to cut the hole to be the size of a standard outlet box. You should be able to get your hand in a hole that size. Once you get it out that way. Go to lowes and get a retro fit box and a blank wall plate to cover it up with.
Good news is he/she only has 16" to move around so its not like its going to be crawling all over your house.
Or just wait it out. It will come out sooner or later just need to be there with it does.
Good look.