I remember, back when cats first started showing up on cars in mass, there were recyclers showing up too and I believe there is platinum used in them and they were recycling that along with the metal. I dont know if that is still true, but if the recyclers are still out there Id be interested in knowing what they get for each of those things.
When the recycler took ours, he took a metal rod, poked it on the inside to to make sure it was still in good shape, and handed me $60 cash.