I too was asked for the VIN # and have been advised by the local police department not to provide this over the internet. I've never sold a car on the web or ever for that matter, but with so many scammers around, people need to be cautious. I don't have enough knowledge to know what nefarious intentions people may have - but the criminals seem to be creative. It seems harmless enough to give the VIN, but again, who knows what the liars and thieves are up to except them? It sucks, but this is the world we live in and I for one, can't afford to be screwed over. Human kindness and honesty seems to be in short supply.