I don't know about other places but here in Arkansas copper sales sky rocketed. They took it as a sign and now any scrap copper your go to turn in you have to have receipts to show original purchase. I think they should start stamping all cats with serials and have a nation wide law stating you have to provide a receipt or papers matching the serial on the cat to sell it. Even with new vehicles, paperwork on the cat can be issued with the manuals and other vehicle information. I don't see why it couldn't happen. Just remember, getting it stolen and doing not but whining about it is helping nothing, get out there and write your state attorney's office about issues such as this.