Ebay motors auto sales/return policies

Someone has offered to sell me a used vehicle using eBbay motors.

This person is out of state and says that the car will be shipped at no cost to me in California and that I will them have 5 days to evaluate the vehicle and return if it I so choose.

I am going to be getting an invoice emailed to me within the next few days and the vehicle will then be shipped to me.

However, in the meantime I would like to do further research.

This vehicle will be shipped 1500 miles to me. In order for me to purchase it it will need to pass the California smog check so it can be registered to me.

I will also be taking this car to my mechanic to have it checked out to make sure everything is OK with it.

If there are any problems like it can't pass smog, needs to have repairs done so it will pass smog, or if my mechanic finds any issues with it I need to be sure I will be getting most of my money back from eBay motors if I choose to return this vehicle.

Please provide me with the URL address that explains eBay motors' policy for these things.