I change out a lot of converters from either collision damage or failures. Here in RI you now have to have the VIN number from the car which the converter came off of ( I think my scrap yard said registration number too ) and a photo ID. A few of the scrap yards won't even take them anymore. I personally do not care about the money because I made money doing the repair so I just need to get rid of the scrap. I throw it in with the regular metals now. With my luck I'd get caught with a pile of converters and my face would be on the evening news.