It seems the only real scam is his rolling back the odometer, which is illegal. You might report him to the authorities. I would think your testimony would be enough to convict.

If you lowered your price out of sympathy for his "new driver son", that is a type of welfare. Before giving welfare, you should check the facts and decide where that rates on your list of beneficiaries. My guess is you simply rationalized that to yourself as a reason for lowering the price because you wanted to get rid of the car. It would be hard to convict him for that. Maybe he truly has a son, and might have given the car to him but decided he could get big money for it instead. Ditto for the Beemer he lists.

I have flipped items before. I decided there were probably a lot of illiterates who couldn't spell "carburetor" so started searching for corruptions on ebay. I bought one on ebay for $25 and sold it for $170. I actually intended to use on my V-8, but found it was a marine version I couldn't use, so is that truly a flip? Kind of hard to sympathise with a seller who lists "Edlebrock" in the title while showing a carb with a clear label "Edelbrock". I got bored with this game, so you guys can try. There are always people who make money off people too lazy to realize full value. Just wait and you might find a family that inherited dad's pristine, vintage car and they list it for $100 because they don't appreciate it and are too lazy to research. I hate to think what my wife would do with my good stuff were I to pass prematurely.

Finally, I wonder what your true motivation is. One guess is seller's remorse, especially since you imagine he will sell "your car" for $5600 and net a nice profit that you could have made. My guess is he will have trouble unloading the car at what you sold it for, especially when potential buyers find he is clueless about it. Most buyers of these cars seek them out and are very knowledgeable. I would think a true flipper would have paid no more than $1000 for it.