My nephew made a heater for his garage out of one of the tall ones.When i got 2 large bottles of gas i had to pay extra deposit as not swapping them and now find deposit is non returnable.
So they aint getting them back and wondered about scrap metal but they own them.
If they refunded money many bottles would get returned.
That's not happening, unless you refill them you are stuck with them, hence my advice to turn them into interesting and useful objects.They are large ones as one is very tall and other is wider as just wanting money back for them.
My son/in/law made a meat smoker out of one of the big ones.That's not happening, unless you refill them you are stuck with them, hence my advice to turn them into interesting and useful objects.
You could paint them grey and stencil a swastika on them, then partially bury them here and there if you enjoy going to prison