Be glad you didn't talk to them. Scrap buyer that turned out to be a scam, hit our area  recently-says they'll be back the next day with big cash $$$ to buy scrap, etc, and takes something not real valuable, asks to pay the next day.  The business owner is happy to make such a big sale so lets them go with a little something....never to return.  They hit us, they did this to a business we know nearby, and no doubt it is their career.  Wish I knew how to get them arrested.