Of course I've found some too good to be true auto listings on cl (so I stayed away), but this is a weird thing to fixate on when there are scams on Amazon, fb marketplace, newspaper classifieds, etc.

As an aside, I think getting involved in making people prove they live at an address to cl is not the right way to do anything, especially in the context of cl, where many listings may have many different people who live together at that same address.